Long form explainers that start with a question most people get wrong, then work through the physics until it makes sense.

Veritasium - Physics and Engineering, Explained

Linear algebra, calculus and neural networks taught through animation, aimed at building intuition before notation.

3Blue1Brown - Mathematics, Visually

Complete recorded lecture series in computer science, physics and mathematics, matched to the published course notes.

Working mathematicians talking through problems, proofs and oddities on brown paper, one idea per video.

The reference most developers actually keep open: language guide, full API listings, and runnable examples for every built in object.

Free preprint archive for physics, mathematics, computer science, quantitative biology and statistics, updated every weekday.

Ownership, borrowing and lifetimes explained from first principles, with projects that build up a working command line program.

Structured courses and certificates taught by university faculty and industry teams, with deadlines and graded work.