Can anyone know any other useful programing books free site and apps ?

Answer 1

Extending Jay Matthews 's answer
Some useful programming apps :
Sololearn
Programming hub
W3 Schools
Tutorials Point
Coursera
EDX

Thanks👍

Answer 2

Big Java Early Objects
Aurthor Cay Horstman

Answer 3

Thank. sangeeth zen

Answer 4

Welcome 😊