Somebody to explain clearly the use of relative,absolute,fixed and scroll positions in HTML

Question

With the use of examples

Answer 1

Check this link to get your solution.

https://www.w3schools.com/cssref/pr_class_position.asp

Answer 2

I really don't understand'm, I will tell you what i understand:
Fixed: if it's set to fixed, the element won't be able to scroll.
it will stay right where it is while the other elements scroll around it.

And, i don't think scroll is a position.

Absolute is sometimes used with :after and :before puesos.

i'm not sure about the other once.(absolute + relative.)