I have quite a very same feeling. But as a way to review things, I also write flashcards when I think there's something useful I'd like to remember, or when I'm studying. Once you start remembering a flashcard, it will appear less and less often.
It's quite simple in Obsidian with the extension "Spaced Repetition":
It's quite simple in Obsidian with the extension "Spaced Repetition":
What is foo? ? foo is bar