Best free resources for Blockchain Developer prep in 2026 — compiled list

Great list. I'd add: LinkedIn Learning has some blockchain & crypto-related courses that overlap with cert content, and if you have a library card many libraries give free access to it. Also check if your local library has access to O'Reilly or similar — tons of technical content there.

The official candidate guide is something a lot of people skip but it literally tells you the topic weighting and domain breakdown. It's the roadmap for your study plan. Never skip it.

For Blockchain Developer specifically, I found the PracticeTestGeeks explanations were detailed enough that I didn't need to buy a separate study guide. The combination of doing the practice questions + reading every explanation (for both right and wrong answers) covered most of the content I needed.

Honestly I almost bailed on this whole thing around month two. The material felt overwhelming and I kept second-guessing whether the free resources were even worth my time. What actually turned it around for me was drilling specific topic areas instead of trying to review everything at once. The blockchain developer smart contract development questions on PracticeTestGeeks were brutal at first but that's kind of the point — if you can get comfortable with those you're in decent shape for the real thing.

I didn't pass on my first attempt and that stung. But going back through the explanations on the questions I missed made a bigger difference than re-reading any study guide. It's slow going but it works. Stick with it.