diff --git a/.gitignore b/.gitignore
index 35008af..79eb637 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
+**/.ipynb_checkpoints/
 .python-version
 .venv/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..40d4f46
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,22 @@
+default_stages: [commit]
+fail_fast: true
+repos:
+- repo: local
+  hooks:
+  - id: fix-branch-references
+    name: Check for wrong branch references
+    entry: poetry run nox -s fix-branch-references --
+    language: system
+    stages: [commit, merge-commit]
+    types: [text]
+# Enable hooks provided by the pre-commit project to
+# enforce rules that local tools could not that easily.
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v3.2.0
+  hooks:
+  - id: check-added-large-files
+    args: [--maxkb=250]
+  - id: check-merge-conflict
+  - id: no-commit-to-branch
+    args: [--branch, main]
+  - id: trailing-whitespace
diff --git a/README.md b/README.md
index 4d95cf0..58bbc94 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,181 @@ in programming with **[Python <img height="12" style="display: inline-block" src
 
 The **main goal** is to **prepare** students
 for **further studies** in the "field" of **data science**.
+
+
+### Prerequisites
+
+To be suitable for *beginners*, there are *no* formal prerequisites.
+It is only expected that the student has:
+- a *solid* understanding of the **English** language,
+- knowledge of **basic mathematics** from high school,
+- the ability to **think conceptually** and **reason logically**, and
+- the willingness to **invest** around **90-120 hours** on this course.
+
+
+## Getting started
+
+If you are a total beginner,
+    follow the instructions in the "Installation" section next.
+If you are familiar with
+    the [git](https://git-scm.com/)
+    and [poetry](https://python-poetry.org/docs/) command-line tools,
+    you may want to look at the "Alternative Installation" section further below.
+
+
+### Installation
+
+To follow this course, an installation of **Python 3.8** or higher is expected.
+
+A popular and beginner friendly way is
+    to install the [Anaconda Distribution](https://www.anaconda.com/products/individual)
+    that not only ships Python itself
+    but also comes pre-packaged with a lot of third-party libraries.
+
+<img src="static/anaconda_download.png" width="50%">
+
+Scroll down to the [download](https://www.anaconda.com/products/individual#Downloads) section
+    and install the latest version for your operating system
+    (i.e., *2020-07* with Python 3.8 at the time of this writing).
+
+After installation,
+    you find an entry "[Anaconda Navigator](https://docs.anaconda.com/anaconda/navigator/)"
+    in your start menu.
+Click on it.
+
+<img src="static/anaconda_start_menu.png" width="50%">
+
+A window opens giving you several options to start various applications.
+In the beginning, we will work mostly with [JupyterLab](https://jupyterlab.readthedocs.io/en/stable/).
+Click on "Launch".
+
+<img src="static/anaconda_navigator.png" width="50%">
+
+A new tab in your web browser opens:
+The website is "localhost" and some number (e.g., 8888).
+
+This is the [JupyterLab](https://jupyterlab.readthedocs.io/en/stable/) application
+    that is used to display the course materials.
+On the left, you see the files and folders on your computer.
+This file browser works like any other.
+In the center, you see several options to launch (i.e., "create") new files.
+
+<img src="static/jupyter_lab.png" width="50%">
+
+To check if your Python installation works,
+    double-click on the "Python 3" tile under the "Notebook" section.
+That opens a new [Jupyter notebook](https://jupyter-notebook.readthedocs.io/en/stable/)
+    named "Untitled.ipynb".
+
+<img src="static/jupyter_notebook_blank.png" width="50%">
+
+Enter some basic Python in the **code cell**, for example, `1 + 2`.
+Then, press the **Enter** key *while* holding down the **Control** key
+    (if that does not work, try with the **Shift** key)
+    to **execute** the snippet.
+The result of the calculation, `3` in the example, shows up below the cell.
+
+<img src="static/jupyter_notebook_example.png" width="50%">
+
+After setting up Python,
+    click on the green "Code" button on the top right on this website
+    to download the course materials.
+As a beginner, choosing "Download ZIP" is likely the easiest option.
+Then, unpack the ZIP file into a folder of your choice,
+    ideally somewhere within your personal user folder
+    so that the files show up right away in [JupyterLab](https://jupyterlab.readthedocs.io/en/stable/).
+
+<img src="static/repo_download.png" width="50%">
+
+
+### Alternative Installation (for Instructors)
+
+Python can also be installed in a "pure" way
+    obtained directly from its core development team [here](https://www.python.org/downloads/).
+Then, it comes *without* any third-party packages,
+    which is *not* a problem at all.
+Managing third-party packages can be automated to a large degree,
+    for example, with tools such as [poetry](https://python-poetry.org/docs/).
+
+However, this may be too "advanced" for a beginner
+    as it involves working with a [command-line interface <img height="12" style="display: inline-block" src="static/link/to_wiki.png">](https://en.wikipedia.org/wiki/Command-line_interface) (CLI),
+    also called a **terminal**,
+    which looks like the one below.
+It is used *without* a mouse by typing commands into it.
+The following instructions assume that
+    [git](https://git-scm.com/), [poetry](https://python-poetry.org/docs/),
+    and [pyenv](https://github.com/pyenv/pyenv) are installed.
+
+<img src="static/cli_install.png" width="50%" align="center">
+
+The screeshot above shows how this project can be set up in an alternative way
+    with the [zsh](https://en.wikipedia.org/wiki/Z_shell) CLI.
+
+First, the [git](https://git-scm.com/) tool is used
+    to **clone** the course materials as a **repository**
+    into a new folder called "*intro-to-python*"
+    that lives under a "*repos*" folder.
+
+- `git clone https://github.com/webartifex/intro-to-python.git`
+
+The `cd` command is used to "change directories".
+
+In the screenshot, the [pyenv](https://github.com/pyenv/pyenv) tool is used
+    to set the project's Python version.
+[pyenv](https://github.com/pyenv/pyenv)'s purpose is
+    to manage *many* parallel Python installations on the same computer.
+It is highly recommended for professional users;
+    however, any other way of installing Python works as well.
+
+- `pyenv local ...`
+
+On the contrary, the [poetry](https://python-poetry.org/docs/) tool is used
+    to manage third-party packages within the *same* Python installation
+    and, more importantly, on a per-project basis.
+So, for example,
+whereas "Project A" may depend on [numpy](https://numpy.org/) *v1.19*
+    from June 2020 be installed,
+    "Project B" may use *v1.14* from January 2018 instead
+    (cf., numpy's [release history](https://pypi.org/project/numpy/#history)).
+To achieve this per-project **isolation**,
+[poetry](https://python-poetry.org/docs/) uses so-called **virtual environments**
+    behind the scenes.
+While one could do that manually,
+    for example, by using Python's built-in
+        [venv <img height="12" style="display: inline-block" src="static/link/to_py.png">](https://docs.python.org/3/library/venv.html) module,
+    it is more convenient and reliable to have [poetry](https://python-poetry.org/docs/)
+        automate this.
+The following *one* command not only
+    creates a new virtual environment (manually: `python -m venv venv`)
+    and *activates* it (manually: `source venv/bin/activate`),
+    it also installs the versions of the project's third-party dependencies
+        as specified in the [poetry.lock](poetry.lock) file
+        (manually: `python -m pip install -r requirements.txt`
+         if a [requirements.txt](https://docs.python.org/3/tutorial/venv.html#managing-packages-with-pip)
+         file is used;
+         the `python -m` part is often left out [but should not be](https://snarky.ca/why-you-should-use-python-m-pip/)):
+
+- `poetry install`
+
+[poetry](https://python-poetry.org/docs/) is also used
+    to execute commands in the project's (virtual) environment.
+The command is then prefixed with `poetry run ...`.
+For example, to do the equivalent of clicking "Launch" in the Anaconda Navigator:
+
+- `poetry run jupyter lab`
+
+This opens a new tab in your web browser just as above.
+The command-line interface stays open in the background,
+    like in the screenshot below,
+    and prints log messages as we work in [JupyterLab](https://jupyterlab.readthedocs.io/en/stable/).
+
+<img src="static/cli_jupyter_lab.png" width="50%" align="center">
+
+
+## About the Author
+
+Alexander Hess is a PhD student
+    at the Chair of Logistics Management at [WHU - Otto Beisheim School of Management](https://www.whu.edu)
+    where he conducts research on urban delivery platforms
+    and teaches coding courses based on Python in the BSc and MBA programs.
+Connect him on [LinkedIn](https://www.linkedin.com/in/webartifex).
\ No newline at end of file
diff --git a/noxfile.py b/noxfile.py
new file mode 100644
index 0000000..184e1b5
--- /dev/null
+++ b/noxfile.py
@@ -0,0 +1,140 @@
+"""Configure nox as the task runner.
+
+Nox provides the following tasks:
+
+- "init-project": install the pre-commit hooks
+
+- "fix-branch-references": adjusts links with git branch references in
+  various files (e.g., Mardown or notebooks)
+
+"""
+
+import contextlib
+import glob
+import os
+import re
+import shutil
+import subprocess
+import tempfile
+
+import nox
+
+
+REPOSITORY = "webartifex/intro-to-python"
+
+# Use a unified .cache/ folder for all develop tools.
+nox.options.envdir = ".cache/nox"
+
+# All tools except git and poetry are project dependencies.
+# Avoid accidental successes if the environment is not set up properly.
+nox.options.error_on_external_run = True
+
+
+@nox.session(name="init-project", venv_backend="none")
+def init_project(session):
+    """Install the pre-commit hooks."""
+    for type_ in (
+        "pre-commit",
+        "pre-merge-commit",
+    ):
+        session.run("poetry", "run", "pre-commit", "install", f"--hook-type={type_}")
+
+
+@nox.session(name="fix-branch-references", venv_backend="none")
+def fix_branch_references(_session):
+    """Change git branch references.
+
+    Intended to be run as a pre-commit hook.
+
+    Many files in the project (e.g., README.md) contain links to resources on
+    github.com, nbviewer.jupyter.org, or mybinder.org that contain git branch
+    labels.
+
+    This task rewrites branch labels into either "main" or "develop".
+    """
+    # Glob patterns that expand into the files whose links are re-written.
+    paths = ["*.md", "**/*.ipynb"]
+
+    branch = (
+        subprocess.check_output(
+            ("git", "rev-parse", "--abbrev-ref", "HEAD"),
+        )
+        .decode()
+        .strip()
+    )
+    # If the current branch is only temporary and will be merged into "main", ...
+    if branch.startswith("release-") or branch.startswith("hotfix-"):
+        branch = "main"
+    # If the branch is not "main", we assume it is a feature branch.
+    elif branch != "main":
+        branch = "develop"
+
+    rewrites = [
+        {
+            "name": "github",
+            "pattern": re.compile(
+                fr"((((http)|(https))://github\.com/{REPOSITORY}/((blob)|(tree))/)([\w-]+)/)"
+            ),
+            "replacement": fr"\2{branch}/",
+        },
+        {
+            "name": "nbviewer",
+            "pattern": re.compile(
+                fr"((((http)|(https))://nbviewer\.jupyter\.org/github/{REPOSITORY}/((blob)|(tree))/)([\w-]+)/)",
+            ),
+            "replacement": fr"\2{branch}/",
+        },
+        {
+            "name": "mybinder",
+            "pattern": re.compile(
+                fr"((((http)|(https))://mybinder\.org/v2/gh/{REPOSITORY}/)([\w-]+)\?)",
+            ),
+            "replacement": fr"\2{branch}?",
+        },
+    ]
+
+    for expanded in _expand(*paths):
+        with _line_by_line_replace(expanded) as (old_file, new_file):
+            for line in old_file:
+                for rewrite in rewrites:
+                    line = re.sub(rewrite["pattern"], rewrite["replacement"], line)
+                new_file.write(line)
+
+
+def _expand(*patterns):
+    """Expand glob patterns into paths.
+
+    Args:
+        *patterns: the patterns to be expanded
+
+    Yields:
+        path: a single expanded path
+    """
+    for pattern in patterns:
+        yield from glob.glob(pattern.strip())
+
+
+@contextlib.contextmanager
+def _line_by_line_replace(path):
+    """Replace/change the lines in a file one by one.
+
+    This generator function yields two file handles, one to the current file
+    (i.e., `old_file`) and one to its replacement (i.e., `new_file`).
+
+    Usage: loop over the lines in `old_file` and write the files to be kept
+    to `new_file`. Files not written to `new_file` are removed!
+
+    Args:
+        path: the file whose lines are to be replaced
+
+    Yields:
+        old_file, new_file: handles to a file and its replacement
+    """
+    file_handle, new_file_path = tempfile.mkstemp()
+    with os.fdopen(file_handle, "w") as new_file:
+        with open(path) as old_file:
+            yield old_file, new_file
+
+    shutil.copymode(path, new_file_path)
+    os.remove(path)
+    shutil.move(new_file_path, path)
diff --git a/poetry.lock b/poetry.lock
index b9e1c09..6b2b916 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,8 +1,1284 @@
-package = []
+[[package]]
+name = "appdirs"
+version = "1.4.4"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "appnope"
+version = "0.1.0"
+description = "Disable App Nap on OS X 10.9"
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "argcomplete"
+version = "1.12.1"
+description = "Bash tab completion for argparse"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.extras]
+test = ["coverage", "flake8", "pexpect", "wheel"]
+
+[[package]]
+name = "argon2-cffi"
+version = "20.1.0"
+description = "The secure Argon2 password hashing algorithm."
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+cffi = ">=1.0.0"
+six = "*"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pytest", "sphinx", "wheel", "pre-commit"]
+docs = ["sphinx"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pytest"]
+
+[[package]]
+name = "async-generator"
+version = "1.10"
+description = "Async generators and context managers for Python 3.5+"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "attrs"
+version = "20.2.0"
+description = "Classes Without Boilerplate"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.extras]
+dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "sphinx", "sphinx-rtd-theme", "pre-commit"]
+docs = ["sphinx", "sphinx-rtd-theme", "zope.interface"]
+tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six"]
+
+[[package]]
+name = "backcall"
+version = "0.2.0"
+description = "Specifications for callback functions passed in to an API"
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "bleach"
+version = "3.2.1"
+description = "An easy safelist-based HTML-sanitizing tool."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.dependencies]
+packaging = "*"
+six = ">=1.9.0"
+webencodings = "*"
+
+[[package]]
+name = "certifi"
+version = "2020.6.20"
+description = "Python package for providing Mozilla's CA Bundle."
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "cffi"
+version = "1.14.3"
+description = "Foreign Function Interface for Python calling C code."
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+pycparser = "*"
+
+[[package]]
+name = "cfgv"
+version = "3.2.0"
+description = "Validate configuration and produce human readable error messages."
+category = "dev"
+optional = false
+python-versions = ">=3.6.1"
+
+[[package]]
+name = "chardet"
+version = "3.0.4"
+description = "Universal encoding detector for Python 2 and 3"
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "colorama"
+version = "0.4.3"
+description = "Cross-platform colored terminal text."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "colorlog"
+version = "4.4.0"
+description = "Log formatting with colors!"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+
+[[package]]
+name = "decorator"
+version = "4.4.2"
+description = "Decorators for Humans"
+category = "main"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*"
+
+[[package]]
+name = "defusedxml"
+version = "0.6.0"
+description = "XML bomb protection for Python stdlib modules"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "distlib"
+version = "0.3.1"
+description = "Distribution utilities"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "entrypoints"
+version = "0.3"
+description = "Discover and load entry points from installed packages."
+category = "main"
+optional = false
+python-versions = ">=2.7"
+
+[[package]]
+name = "filelock"
+version = "3.0.12"
+description = "A platform independent file lock."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "identify"
+version = "1.5.6"
+description = "File identification library for Python"
+category = "dev"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+
+[package.extras]
+license = ["editdistance"]
+
+[[package]]
+name = "idna"
+version = "2.10"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "ipykernel"
+version = "5.3.4"
+description = "IPython Kernel for Jupyter"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
+[package.dependencies]
+appnope = {version = "*", markers = "platform_system == \"Darwin\""}
+ipython = ">=5.0.0"
+jupyter-client = "*"
+tornado = ">=4.2"
+traitlets = ">=4.1.0"
+
+[package.extras]
+test = ["pytest (!=5.3.4)", "pytest-cov", "flaky", "nose"]
+
+[[package]]
+name = "ipython"
+version = "7.18.1"
+description = "IPython: Productive Interactive Computing"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.dependencies]
+appnope = {version = "*", markers = "sys_platform == \"darwin\""}
+backcall = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+decorator = "*"
+jedi = ">=0.10"
+pexpect = {version = ">4.3", markers = "sys_platform != \"win32\""}
+pickleshare = "*"
+prompt-toolkit = ">=2.0.0,<3.0.0 || >3.0.0,<3.0.1 || >3.0.1,<3.1.0"
+pygments = "*"
+traitlets = ">=4.2"
+
+[package.extras]
+all = ["Sphinx (>=1.3)", "ipykernel", "ipyparallel", "ipywidgets", "nbconvert", "nbformat", "nose (>=0.10.1)", "notebook", "numpy (>=1.14)", "pygments", "qtconsole", "requests", "testpath"]
+doc = ["Sphinx (>=1.3)"]
+kernel = ["ipykernel"]
+nbconvert = ["nbconvert"]
+nbformat = ["nbformat"]
+notebook = ["notebook", "ipywidgets"]
+parallel = ["ipyparallel"]
+qtconsole = ["qtconsole"]
+test = ["nose (>=0.10.1)", "requests", "testpath", "pygments", "nbformat", "ipykernel", "numpy (>=1.14)"]
+
+[[package]]
+name = "ipython-genutils"
+version = "0.2.0"
+description = "Vestigial utilities from IPython"
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "jedi"
+version = "0.17.2"
+description = "An autocompletion tool for Python that can be used for text editors."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.dependencies]
+parso = ">=0.7.0,<0.8.0"
+
+[package.extras]
+qa = ["flake8 (3.7.9)"]
+testing = ["Django (<3.1)", "colorama", "docopt", "pytest (>=3.9.0,<5.0.0)"]
+
+[[package]]
+name = "jinja2"
+version = "2.11.2"
+description = "A very fast and expressive template engine."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.dependencies]
+MarkupSafe = ">=0.23"
+
+[package.extras]
+i18n = ["Babel (>=0.8)"]
+
+[[package]]
+name = "json5"
+version = "0.9.5"
+description = "A Python implementation of the JSON5 data format."
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.extras]
+dev = ["hypothesis"]
+
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diff --git a/pyproject.toml b/pyproject.toml
index 6f05059..c06108c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,4 +13,9 @@ license = "MIT"
 [tool.poetry.dependencies]
 python = "^3.8"
 
+jupyterlab = "^2.2.8"
+
 [tool.poetry.dev-dependencies]
+# Task runners
+nox = "^2020.8.22"
+pre-commit = "^2.7.1"
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