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