Other have great recommendations. Two of mine:

1. The Java Programming Language book:

The K&R of Java

https://www.amazon.com/Java-Programming-Language-4th/dp/0321...

2. Zantorc's videos: https://www.youtube.com/@Zantorc/

He really gets into the nitty gritty. You can listen to this while commuting, etc; Just finish 1 video per 3 days, say. It adds up quickly.