- Julia Evans is one the best people to follow if you wish to understand a tech topic in depth. She has covered a lot of ground.
- Gary Bernhardt's courses are some of the best out there, (I have done/am doing his JS and TS courses)
- Jimmy Cleveland's videos on Webpack are great.
- Remix founders Michael Jackson and Ryan Florence (check Remix's and their personal YouTube channels too)
- Tailwind CSS's Adam Wathan
- Shawn Wang's book is very good!
- Michael Thiessen for Vue
- Tyler McGinnis' videos are very good!
More in this Twitter list.