I'm at a loss on how to manage my vault

I know this topic has been discussed ad nauseam already, but I’ve searched everywhere and couldn’t find a solution for my particular use-case. I’m an IT sysadmin so I have a lot of knowledge I would like to document, but I don’t want to mix everything together. Not all my documented knowledge is equal and I don’t want to end up with a dozen folders with sub-folders. I would like to keep it as concise as possible.

Here’s a brief overview of what I have in my vault.

  • Personal diary
  • Journals to track personal things like movies, video games, etc.
  • Break and fix procedures (IT)
  • Standard operating procedures (IT)
  • Personal subjects/hobbies like 3d printing, artificial intelligence, coding, Photoshop, photography, etc.
  • Personal notes for my ADHD.
  • Notes about various topics
  • Wikipedia like pages for researched topics (no annotations). E.g., how cancer develops, political ideologies.

Any help will be greatly appreciated!