"All C++20 core language features with examples" by Oleksandr Koval
https://oleksandrkvl.github.io/2021/04/02/cpp-20-overview.html
"The story behind this article is very simple, I wanted to learn about
new C++20 language features and to have a brief summary for all of them
on a single page. So, I decided to read all proposals and create this
“cheat sheet” that explains and demonstrates each feature. This is not a
“best practices” kind of article, it serves only demonstrational
purpose. Most examples were inspired or directly taken from
corresponding proposals, all credit goes to their authors and to members
of ISO C++ committee for their work. Enjoy!"
That is a lot of examples.
Lynn