Most permission tutorials start with the table. Nine bits, three triplets, r is 4, w is 2, x is 1. You read it, you nod, and a week later you are pasting chmod 777 from a forum answer like everyone else.
Source: [Dev.to](https://dev.to/thelinuxcamp/linux-permissions-explained-by-breaking-them-on-purposepublished-true-12l0)