enhance

source/getting-started.rst

@@ -46,14 +46,26 @@ Here are some great installation guides for various system types:
 - `Installing Python 3 Properly on Linux <http://docs.python-guide.org/en/latest/starting/install3/linux/>`_
 - `Installing Python 3 Properly on Windows <http://docs.python-guide.org/en/latest/starting/install3/windows/>`_
 
+Understanding Dependencies
+--------------------------
+
+Applications, scripts, and utlities built with Python typicaly have *dependencies* attached to them, which are Python modules they require to run/operate with, that need to be installed before you can use the sotware.
+
+A package manager, like *pipenv* (which we'll cover shortly), or the lower–level *pip* (in conjunction with *virtalenv* can be used to install and manage these dependencies, which are typically hosted on either on `PyPi (The Python Package Index) <https://pypi.python.org/>`_ or `GitHub <https://github.com/>`.
+
+You'll typically see these required packages (and any specific versions) declared in one of the following files: ``Pipfile``, ``requirements.txt``, or ``setup.py``. 
+
 Installing Pipenv
 -----------------
 
 The next step is to install *Pipenv*, our packaging tool of choice. Package mangers allow us to easily manage (resolve, install, uninstall) dependencies and virtual environments for projects.
 
-
 Python.org has a `great guide <https://packaging.python.org/tutorials/managing-dependencies/>`_ available for installing Pipenv that also covers its basic usage.
 
+If you're on a Mac, and have `homebrew <https://brew.sh>`_ installed, the following command will suffice::
+
+    $ brew install pipenv
+    
 Here's a great `blog post <https://bryson3gps.wordpress.com/2017/11/08/stop-everything-start-using-pipenv/>`_ covering the basic concepts presented by Pipenv, and why it's an excellent choice for your first project. 
 
 Using Pipenv