Computer parts (Droylsden M18)

I'm after pc parts I'm going to learn how to build my partner her own pc so parts of pcs would be great I love it when do things and I do it properly and when all done I sit bk and think wow I can do that I have a form of ADHD when ive got to do something all time and can't sit still long so learning how to build my partner her own pc would be great