Good Humble Java Book Bundle from Packt publisher for very small money (from 1€ for 3 books + 2 vidoe courses up to 15€ for 15 books + videos)
Also you can find bundls of books for other topics (DevOps available now)
#java #courses #books #junior #middle #senior
https://www.humblebundle.com/books/java-by-packt-books