FUUUU- HELP WANTED PLEASE

so I’m trying to mod my minecraft, and I know how to do it for the most part, I watched tons of tutorials.

One problem.

I CAN’T FIND THE MINECRAFT FOLDER.

I searched everywhere. Nothing. Not even minecraft.jar

I have winrar, and a paid version of minecraft from the website.

Seriously. I can’t figure this out.

I’m gonna try it on my brother’s tower tomorrow, see if it has a minecraft folder.

ALL I WANT TO DO IS HAVE TOOMANYITEMS SO I CAN BUILD AWESOME CRAP.

Can someone please help?