B.L.U.E. stands for Broadlearning Universal Education. It’s the system that Praxis runs on.
If you’ve ever tried to learn something from YouTube tutorials, you know the problem: every video assumes different prior knowledge. One tutorial expects you to know Linux basics. The next one expects you to know networking. There’s no order.
B.L.U.E. fixes that by organizing everything by prerequisite level.
How It Works
Every guide has a level number:
- L1 — No prior knowledge needed. Start here.
- L2 — Requires L1 knowledge in the same subject.
- L3 — Requires L2. And so on.
You can’t skip levels within a subject. If you’re on L2, the L2 guide assumes you’ve done the L1 guide. Not “you should probably know this” — it literally links to the L1 guide as a prerequisite.
This sounds restrictive but it’s actually freeing. You never wonder if you’re ready for a guide. Either you’ve done the prereqs or you haven’t. No guesswork.
Why Levels Instead of Tags or Playlists
Tags tell you what a guide covers but not what order to read them. Playlists are better but they’re rigid — one path, one sequence.
B.L.U.E. gives you a tree. Each subject has its own level track. You can be L2 in Homelab and L1 in Computer Engineering at the same time. You progress in each subject independently.
Multiple Methods
Some topics have more than one valid approach. A homelab guide might have a “Budget Build” method and a “Mid-Range Build” method. You pick the one that fits your situation.
Both methods are written by the same author. Both are verified. Neither is the “right” one — they’re different paths to the same outcome.
Verification
Every guide goes through a jury review before it’s marked verified. A group of qualified people in that subject read the guide independently and vote.
Unverified doesn’t mean bad. It means it hasn’t been through the process yet. That’s where most guides live at any given time.
Where the Name Comes From
B.L.U.E. was originally proposed in this video about how learning resources should work. The idea stuck — structure knowledge by prerequisites, verify by community, keep it free. Praxis is the implementation.
Next Steps
Ready to browse? Go to the Subjects page, or read Browsing and Searching to learn how to find guides.