Not seeing real-life examples is the most frustrating thing about JD in my opinion. Not John Noble's fault of course. In that spirit. My structure is below.

  - 10-19 Documents
    - 11 Scans
    - 12 Health
    - 13 Travel
    - 14 Contracts
    - 15 Home
    - 16 Visas
    - 17 Education
    - 18 Employment
  
 - 20-29 Finance
    - 21 Banks
    - 22 Bills
    - 23 Investments
    - 24 Taxes
  
  - 30-39 Hobbies
    - 31 Hiking
    - 32 Running
    - 33 Climbing
    - 34 Music
    - 35 Programming
    - 36 Yoga

  - 40-49  UNUSED

  - 50-59 Work
    - 51 Archive
    - 52 Work Project 1
    - 53 Work Project 2
    - 54 Literature
    - 55 Code in language 1
    - 56 Code in language 2
    - 57 Publications
    - 58 PPTs
    - 59 Trainings

  - 60-69 UNUSED

  - 70-79 UNUSED

  - 80-89 UNUSED

  - 90-99 Writing
    - 91 Drafts
    - 92 Personal Vault
    - 93 Work Vault
    - 94 Website 1 SSG contents
    - 95 Website 2 SSG contens

I generated this using: https://johnny-decimal-generator.netlify.app/

The Writing bits contain my two obsidian vaults as well as the static site generator contents for two websites I write on. As you can see, pretty much most things of any importance are covered, and yet I've got tonnes of space free to add onto later. Hope HN formats this danged list properly.

I'm far from a strict adherent to it though. Not everything is three levels deep. Some things are much more than that (like the SSG stuff for instance). But this is real life and not an abstraction after all.

I’m really liking the look of this but I’m curious as for what happens if you have more than ten hobbies, for example?

Just do subcategories like the actual Dewey Decimal system

30 Hobbies 31 Solo sports 31.1 Weight Lifting 31.2 Running 32 Team sports 32.1 Football 33...

You get the idea.

Perhaps one of the unused ones will start to get used? Or I might combine a few into Outdoors. To be seen!

Thanks for sharing! I will try this out with work files - personal work files so far. If I like it probably also for personal files. I suspect lots of personal stuff will still be outside the system - like coding projects. I don't like to have coding roots to far away from $HOME

To avoid changing of categories, it's ok to use this without the numbers in the beginning, to allow yourself to change things easily