I'm currently learning how to mod and I'm not really that familiar with everything I can do so I was hoping that someone could help answer some questions I have

Can I edit the properties of existing structures like changing cost or category

Can I edit the cost of existing resources like making ingots cost less to smelt

I'm hoping to make a mod that's an "easy mode' of sorts where this cost a bit less among other things and these are two big parts that I can't figure out so help would be greatly appreciated