A feature that will help you navigate through larger courses is the "jump to heading" feature. When you click on a course and you see the lesson list for the course a third new drop down menu will show up at the top of the page. This drop down will give you the ability to jump quickly to a specific section/heading within a course which will reduce your need to scroll.
When you go to a course you'll see a third drop down menu that is a "jump to heading" menu.
Now choose a heading/section within a course to quickly jump to.
When you choose an option from the drop down it will jump to that heading on the page.