Four things to know, and then you are fluent.
The front page is today. It shows the most recent class. If you were away, start there.
Search beats clicking. ⌘ + K on a Mac, Ctrl + K on Windows. Three letters is usually enough.
Every blue word is a link, and every link is deliberate. A class page links to the concept it teaches, the text it reads, and the task it serves. Follow one and you land on the page that explains it properly.
The bottom of a page says where else it is used. “When did we do this?” lists every page that links to the one you are reading — which is how you find the four classes that used Theme and Thesis without keeping a list.
On your phone
The folder list hides behind the menu icon at the top left, and the page contents behind the one at the top right. Everything else is the same.