Modified January 2, 2021
The ``tour'' is a quick (about 240 pages) tutorial overview of all of standard C++ (language and standard library) at a moderately high level for people who already know C++ or at least are experienced programmers. It covers C++17 plus a few likely features of C++20.
Available here:
If you are looking for an an introduction to programming for people who has never programmed before, consider Programming -- Principles and Practice Using C++. That book is also be useful for people who have programmed a bit and want to improve their style and technique - or to simply learn modern C++. It is designed for classroom use, but written with an eye on self study.
Constructive comments and reports of errors are always welcome.