Hi @_marc , thanks for posting, and welcome to the community!
I’ve found that the best advice is the one I see most often on this forum: just start writing. Don’t create folders, don’t worry much about structure; just start writing notes. One note per class seems like a good way to start, with maybe a Home note that links to each class.
As your class notes grow in size you’ll naturally want to break them into smaller notes and link to them from the class note. Over time a natural structure will emerge, and it will become clear where you want to use folders and tags – if at all!
One of the beautiful things about Obsidian is that it’s flexible enough for you to adapt the content to the way you think.
Good luck, and please keep the questions and ideas coming!
Craig
P.S.: A popular organization strategy I like is called Linking Your Thinking, but I recommend waiting to explore that link until you have at least a few dozen notes in your vault.
