We need to have a section in our user guide introducing new users to a few concepts similar to what was present in our basics tutorial: https://github.com/scikit-learn/scikit-learn/blob/bc7e52ad7379fd8138418619a1cb0aeef07896a9/doc/tutorial/basic/tutorial.rst

This can go into our "Getting Started" or can be something linked from "Getting Started" page.

We should also link from our docs to the MOOC: https://inria.github.io/scikit-learn-mooc/