The use of git and understanding/working with foreign keys and performing (including the understanding) JOIN queries.

Also, it took me years and to understand OOP.

When think back to my code from before that, my brain spontaneously starts bleeding.

What did you find so difficult about OOP?
I see this often, but never had many issues with it myself.
Maybe I just still don't get it :P

@Geoxion Just the whole principle about it in comparison to procedural :)

@linuxxx Maybe it's because I started in an OOP language.
Right now I have to use C at work and I'm wondering how people can build entire OS's in this.
So I have kind of the reverse problem XD

@AlexDeLarge If functional programming is the same as procedural (hear the term lot but don't know what it means exactly 😅) then I've done it for a few years before doing OOP yes :)

@linuxxx functional programming is the exact opposite of procedural 😂
From our beloved Wikipedia:

In computer science, functional programmingis a programming paradigm—a style of building the structure and elements of computer programs—that treats computationas the evaluation of mathematical functionsand avoids changing-state and mutable data. It is a declarative programming paradigm, which means programming is done with expressions[1] or declarations[2] instead of statements.

@valent0ne well fuck my study. They taught me that.