New modder here.
I have very light prior experience in : HTML5, CSS3, JavaScript.

I'm seeking to do mods such as stat changes, drop tables, skill behavior edits, starting stat mods, reward changes and general changes to affect the Main Campaign experience.

Maybe I've gone about it wrong but many tutorials do not seem to speak of anything I'm trying to do. There was one that was going to go on about stat changes in an excel however the guy doing it dropped off the face of the earth immediately.

After much frustration and confusion here I am. I hope someone can simply point me in the right direction. I would just like to know how to effect some simple changes to my Main Story Experience.