When I went on a Modern C++ bender a year or two ago I went with Stroustrup's A Tour of C++ (2nd edition when I bought it, 3rd is out now). It was a good read,

When I went on a Modern C++ bender a year or two ago I went with Stroustrup's A Tour of C++ (2nd edition when I bought it, 3rd is out now). It was a good read, covered a lot of details quickly. The rest of my re-learning was using cppreference and reading through the list of standard types and functions/methods on them, trying to translate old (clunky, often subtly broken) C++03 code into modern C++. https://www.stroustrup.com/tour3.html https://www.stroustrup.com/tour3.html https://en.cppreference.com/w/ https://en.cppreference.com/w/