Answer 1

See Filip's post:
https://www.sololearn.com/Discuss/204501/?ref=app

Answer 2

My advice is subscribe to Scribd, it's free for one month and you have access to thousands of books and documents on programming (and on many other subjects).

Answer 3

you can download n number of books in pdf form , free of cost
from
www.pdfdrive.com
check it....

Answer 4

Hello Nasif

I don't think it is legal for anyone to share downloaded versions of books which have been published under license. Unless the publisher or the author of the books have authorized them to do so. If what you want to do is learn then I recommend using SoloLearn as it is as effective as most of the books available our there. :)