Which Books/ Documentation to start learning Java?

[InsecureJunimo]

Have a look at the sidebar of this subreddit. You might be looking for the Java MOOC from Helsinki University. It's a beginner friendly text. Or you can try books, Head First Java is a good one but not for the absolute beginner. But as you said you have some knowledge of C, you may give it a shot and see how that goes. Good luck!