I like watching 30-to-90 minute videos to learn about some new domain, and I feel like YouTube videos could have less fillers than Netflix documentaries in that duration range.
Examples of videos I watched and would recommend to anyone no matter their expertise:
* The Secret Life of the Electric light: https://youtu.be/W79s0PsHhDc
* Fun to Imagine with Richard Feynman: https://youtu.be/P1ww1IXRfTA
* A mind-expanding tour of the cosmos with Neil deGrasse Tyson: https://youtu.be/AyAK3QBnMGQ
* The magic of chemistry with Andrew Szydlo: https://youtu.be/0g8lANs6zpQ
* The Beauty of Bézier Curves: https://youtu.be/aVwxzDHniEw
* All about musical scales: https://youtu.be/Vq2xt2D3e3E
* Woodturning a modern chess set: https://youtu.be/bmTcWoXTxi4
* How Imaginary Numbers Were Invented: https://youtu.be/cUzklzVXJwo
Visualization of Quantum Physics (Quantum Mechanics): https://youtu.be/p7bzE1E5PMY
history of the entire world, i guess: https://www.youtube.com/watch?v=xuCn8ux2gbs
TIMELAPSE OF THE FUTURE: A Journey to the End of Time (4K): https://youtu.be/uD4izuDMUQA
Humanity was born way ahead of its time. The reason is grabby aliens. and Grabby aliens: when we'll meet them, how big they are, and other predictions
https://youtu.be/l3whaviTqqg
https://youtu.be/LceY7nhi6j4
Everyday Astronaut videos (he has 90 min documentary on Soviet rocket engine): https://www.youtube.com/channel/UC6uKrU_WqJ1R2HMTY3LIx5Q
Cool Worlds - a lot of 25-35 min very nice astronomy explanations: https://www.youtube.com/c/CoolWorldsLab
'A Universe From Nothing' by Lawrence Krauss: https://www.youtube.com/watch?v=7ImvlS8PLIo