@b0rk It’s entirely normal to learn new “basic” things with Linux/Unix/POSIX command line usage because there is so much lurking right under the surface, and people come to it by learning different workable subsets.
I had a big leap forward in my efficiency almost 20y into my career due entirely to having a new senior sysadmin join our team. We worked in radically different styles; just seeing his work in his style added a pile of little things to my knowledge that I've used ever since.