The Problem is, that i didn't learned C++ by a Book or something, i knew already a bunch of Coding Languages began then with C++ and there were already nearly nothing to learn, because i saw nearly everything of it in any language in any way except the pointer arithmetics.
Honestly i learned the most things by just taking a Reference Project which does kind of what i'm searching for and write it as i need it to be.
But to be fair, it also took like 15 Years to reach this Level xD so maybe you learn faster with a propper learning Way.
I really hope someone else have better tips then me, because i feel very useless in this question, i'm very sorry