
'The Java Programming Language' - by James Gosling.
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.
Effective Java is also a great read for becoming a "better" Java programmer, but may or may not be useful to you right off the bat.
This is the equivalent to The C++ Programming Language. Written by Ken Arnold, James Gosling, etc.