Answer 1

Try some of the Bjarne Stroustrup's(the creator of c++) books and tutorials or
Dennis Ritchie's(the creator of c) books.
But I think the best way to learn something is to try to do it. I mean if you want to make games just try to make a little game and you will see what you need to learn.
https://github.com/borislavvv00
If you want to see my works.

See Scott Meyers Effective C++ book series.