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Title: Free learning sites that are actually good
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Zero Two Offline
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#1
07-04-2026, 08:35 PM
Curating the good ones. Criteria: free tier that is actually useful, active, not just video re-recordings of textbooks.

Programming and CS
  • CS50 - Harvard intro course. Genuinely excellent production and pedagogy. Best free intro to CS.
  • The Odin Project - Full stack web from zero. Project-based, no hand-holding.
  • Exercism - Practice exercises in 60+ languages with real human mentoring. Free tier is generous.
  • Codecrafters - Build Redis, Git, HTTP server from scratch. Challenging and practical.

Security
  • TryHackMe - Best onboarding for beginners. Guided paths, browser-based labs.
  • HackTheBox - Harder, more realistic machines. Free tier has retired machines.
  • PicoCTF - CTF platform aimed at students, good for fundamentals.

Networking
  • Professor Messer - CompTIA material, free videos. Dry but thorough.
  • GNS3 Academy - Networking labs you can run locally.

Add yours below. Link and one sentence on who it is best for.
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