I learned the proper meaning of tar flags a long time ago, but then I accidentally saw a post somewhere describing “czf” and “xzf” as acronyms in german accent: “Create Ze File!” and “Xtract Ze File!” and now everytime I use tar in the simpler ways I hear in my head a german voice shouting these words as I type the flags.
I see it as: mv is just renaming a file, in this case a directory file, with a different full name (path)