hello guys!! i just want to seek help specifically, if possible, can you give me a detailed step by step process about port forwarding??

i've been trying to do this myself but i end up on sites where i can't understand how to do things. maybe you can offer me layman's steps so i can fully understand what i have to do.. please forgive me, i'm really not good at this things.

i will greatly appreciate your help guys.. thanks..