1. https://www.learncpp.com/ - 100% free website, where most game hackers start their journey. They teach you to learn as well.
2. Bjarne Stoustroup's (The Creator) books on C++
3. https://en.cppreference.com/w/
4. https://www.cplusplus.com/
5. MSDN Guide to Modern C++
6. MSDN in General, a great resource, especially if you're doing Windows oriented coding.

The key isn't to read them all, it's to pick one and grind it until you are prepared to use other resources.
I would start with learncpp.

Happy Coding