Starting a new thread to avoid derailing the previous one.
Could you provide a link to the C++ tutorial? I found C++ Programming Tutorial in Chemistry on GitHub. I should relearn C++, if only to access the vast amount of C++ software for scientific computing and machine learning. I can start with Stroustrup’s A Tour of C++, 2nd Edition (2018), which is only 256 pages. A 2nd edition of Discovering Modern C++: An Intensive Course for Scientists, Engineers, and Programmers is to be published in April 2021.