https://www.youtube.com/watch?v=RNH4zpVUm3E
Folder organization in Obsidian can be tricky. This video shows you different ways to set things up, so you can find what works for you. No perfect system here - just ideas to help you get your stuff sorted the way you like it.
also another video from the same guy on customizing obsidian with a beautiful theme https://www.youtube.com/watch?v=lUZjpIhYOEw