Don't use classes.

lol reply: get bent you fucking rodent

There are videos about how bad OOP is and shit like that

Why not?

Use functions

Well how to use c# then?!

Depends. If a project is very small and language is similar to Javascript then I might even say thats a good advice to avoid huge overhead because "you have to use classes". Its good to always think of alternatives. Sometimes you might get a better code solution with less clutter.

If you can't do classes well then don't do classes.

Classes when done well are much better than functions alone imho