There’s much more to Drupal. Comments, forums, actions, shortcuts… That’s just in core. There are modules like Panels, Rules, Commerce, and thousands of others.
You’ll learn more Drupal as we go through the course, but not everything. There’s sooo much more. Do the Drupal Google, and you’ll find tutorials on all sorts of things. (Make sure you look at Drupal 8 tutorials.)
You’re ready to make some IS. Let’s go!