In 2021, the best resources to learn C++ are:
https://www.learncpp.com/
https://en.cppreference.com/w/
https://cplusplus.com/

This is an excellent video series:
https://www.youtube.com/watch?v=18c3...fGUldqGD0S4FFb

I would recommend anyone using Windows to use Visual Studio Community(the latest version) to learn, it makes everything much easier, intellisense is incredibly powerful and will help you fix your errors.