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> https://cppinsights.io/ it's a must so you can investigate what gets generated by templates behind the scenes.
> http://eel.is/c++draft/ bookmark this, you will need it!
Now, about books I would suggest the latest "A tour of C++" by Bjarne Stroustrup; it's ideal for experienced programmers that want to learn modern C++ rather fast.
Other books would be Scott Meyers' Effective Series, Andrei Alexandrescu and Herb Sutter are a must, and of course Jason Turner's "C++ Weekly" series [1]; of course apart from the books, the links I have originally shared are more than enough to cover everything around C++.
[1] https://www.youtube.com/c/lefticus1/videos