Some of the best teaching in the world is free, and most of it is on YouTube. A patient engineer explaining context windows, a chef showing how dough should feel, a professor working a proof on a whiteboard. The teaching is there. What is missing is everything a course wraps around it.
The problem is not content
A learner who opens YouTube to study faces three problems that have nothing to do with the quality of any single video.
- No order. Search and recommendations rank videos for engagement, not for what you need to know first. You jump from an advanced talk to a beginner recap and back.
- No checkpoints. Nothing marks where you stopped or what you have already covered, so revisiting a topic means starting from scratch.
- No evidence. Watching feels like learning. Without a question at the end, there is no way to tell whether it was.
The third problem matters most. Decades of research show that the feeling of fluency while watching is a poor guide to what you will remember, and that answering questions is one of the most effective ways to learn. We cover that research in the Learning Science notes.