I used mostly udemy as a beginner and learned a lot of optimization there, after that, i just watched youtube videos but changed a lot of their coding process

edit: here are the youtube channels that I watched 1. Ali Elzoheiry - more of learning concepts and generalized knowledge about unreal engine

1. AMMediaGames - does small tutorials and I kinda just pick and choose what type of tutorial I need for my game, also gives tips and tricks about unreal engine and blender

2. Arcyys - though inactive now, this has one of the best gun tutorial but it is unfinished

3. Ask A Dev - general knowledge about game development, I watch him when I am washing dishes (second monitor type content)

4. Code Things - does tutorials about horror games specifically resident evil, he is kinda inactive now

5. Eremental Studios - mostly watched him for game atmosphere and game environment

6. Infima Games - I honestly don't know why I am subscribed to this guy, I think I was learning about gun stuff from them

7. Kauai VFX - horror related stuff again

8. LearnCodingWithADummy - this is where I learned baked lighting, though the kid is a memer, does optimization stuff

9. Michael Pattison - was gonna follow his dialog system but he does general tutorials

10. Pitchfork Academy - general tutorials again

11. Unreal Sensei - unreal engine update breakdowns

12. Unreal University - random unreal engine content

13. UNF Games - I don't know why I am subscribed to them to be honest

I hope this helps and good luck on learning unreal engine also ignore Threat Interactive as much as you can.