Study Materials for Java

Recently studied a book “Spring in Action- version 4, 2015 edition”, an old book(it’s lockdown so read old edition).

But completely unsatisfied. Lack of details behind every operation.
Contains some errors too.

Wanna know what’s the “Detailed & Correct” material for Spring, Spring boot and Thymeleaf ?

(It must be an offline book that can be bought in India).

Also, this editing box has some bugs too. formatting requires attention. problem with B and I buttons