Cheers matey

I understand the green arrow skills and the fact that red arrows pointing down generally mean useless weapon

but what i get totally confused with is when i assign a weapon say a Sword and then when i use another skill Say R2 it says something like will not work with weapon selected ?
So i spend half my time trying to work out what works with what on the menu screen which for my pea brain is far to complicated .
Even when I'm talking to the bloke in the town [iron monger] or whatever and I'm clicking on forging weapons and i get are you sure I'm thinking am i doing stuff right here or what,when he does forge something I'm not exactly sure where it is and how I'm suppose to assign the thing he created.
Never been a lover of these type of games like this and anything that has a stats screen and many sub menus and crafting screens.