Open a note as a keyboard-first mind map and edit it in place. The note stays an ordinary heading with a nested list.
Study flashcards written in your notes, with spaced repetition (FSRS): each level-2 heading in a .cards.md note is a card, and each review is saved in that note, so your progress syncs with the vault.
Draw system design diagrams from a few lines of text or by clicking, save versions and see what changed. Each diagram is a Markdown note with a code block.
Draw in your vault with the Excalidraw editor. Each drawing stays a plain .excalidraw file that excalidraw.com opens, written only when you change it.