The videos of my two Back to Basic talks at CppCon 2020 are available on Youtube:
Back to Basics: C++ Templates Part 1
Back to Basics: C++ Templates Part 2
You can find a list with questions and my answers asked during the talks here: 2020/09/cppcon-b2b-talk-cpp-templates-questions-and-answers/. I hope you enjoy the talks and learn something. In case you like additional material, I have written a book with tips and tricks around templates: Notebook C++: Tips and Tricks with Templates.