Move virtual environment explanation to installation

doc/tutorial/index.rst

@@ -29,10 +29,7 @@ which also supports *automatic* documentation generation.
 To follow the instructions you will need access to a Linux-like command line
 and a basic understanding of how it works,
 as well as a working Python installation for development,
-since you will use *Python virtual environments* to create the project
-(you can read more about them in the `Python Packaging User Guide`_).
-
-.. _Python Packaging User Guide: https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/#creating-a-virtual-environment
+since you will use *Python virtual environments* to create the project.
 
 Getting started
 ---------------

doc/usage/installation.rst

@@ -185,6 +185,30 @@ the ``--pre`` flag.
 
    $ pip install -U --pre sphinx
 
+Using virtual environments
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+When installing Sphinx using pip,
+it is highly recommended to use *virtual environments*,
+which isolate the Installation
+and remove the need to use administrator privileges.
+To create a virtual environment in the ``.venv`` directory,
+use the following command.
+
+::
+
+   $ python -m venv .venv
+
+You can read more about them in the `Python Packaging User Guide`_.
+
+.. _Python Packaging User Guide: https://packaging.python.org/guides/installing-using-pip-and-virtual-environments/#creating-a-virtual-environment
+
+.. warning::
+
+   Note like in some Linux distributions like Debian and Ubuntu
+   this might require an extra installation step::
+
+     $ apt-get install python3-venv
 
 Docker
 ------