Coding Tech takes programming related talks from all types of conferences and aggregates them into their one channel. Always interesting and always high level.

https://www.youtube.com/channel/UCtxCXg-UvSnTKPOzLH4wJaQ

Also, Siraj: https://www.youtube.com/channel/UCWN3xxRkmTPmbKwht9FuE5A

Siraj gives you the quick and dirty on how complex problems are solved with code. Not really tutorials, but more of a "how to" you can use to start your research.