I need help setting up permmisions

Ok, let me start by saying I have spent close to 3 hours now trying to get this to work. I have read forms, used a yml checker thingy basically everything so this is my last hope. let me get this clear: I AM A BEGGINER dont bully me for stupid things please. Anyway here is my code that I wanted to test to make sure things were fine. The error message I get in game is “you dont have permission to do that” when i do /kit starter. Oh one last thing, I just want experience with this sorta stuff, i find it interesting. I am not going to actually open a server, i have no idea to to run one!