I still find myself hoping (probably futilely) that Bjarne Stroustrop will come out with a new edition of The C++ Programming Language, to help me understand all the features that have been added to it since C++14...
If you haven't seen "A Tour of C++":
https://stroustrup.com/tour3.html
If you haven't seen "A Tour of C++":
https://stroustrup.com/tour3.html