Source to learn c++ on a better level

Answer 1

Some resources here:-)
https://www.sololearn.com/Discuss/459759/?ref=app

Answer 2

I don't know any books for C++ but this link might be helpful
https://www.sololearn.com/discuss/923664/?ref=app

Answer 3

Never underestimate BOOKS
and you may want to visit tutorialspoint.com,
udemy.com
thenewboston on youtube

Answer 4

Some useful links here:
https://code.sololearn.com/WaVusr8J1KvK/

Answer 5

suggest a few books no problem with reading

Answer 6

https://stackoverflow.com/a/388282/8004264
This is the list of books of the StackOverflow community, created and maintained by experts.