Mycodeschool: https://www.youtube.com/user/mycodeschool - Great for a refresher esp. if you are starting with interview style questions
Google Developers: https://www.youtube.com/user/GoogleDevelopers
Oreilly - https://www.youtube.com/user/OreillyMedia/videos -> Need to look at playlists to find really relevant ones. But good videos on AI, microservices and software architecture