When I got into C++ several years ago, I read "A Tour of C++" by the creator of C++, Bjarne Stroustrup, and thought it was quite good: https://www.stroustrup.c

When I got into C++ several years ago, I read "A Tour of C++" by the creator of C++, Bjarne Stroustrup, and thought it was quite good: https://www.stroustrup.com/tour2.html https://www.stroustrup.com/tour2.html The second edition is from 2018 and uses modern C++ (C++17). So, I would say read that and then write a bunch of C++ code to learn by doing.