What i did was to start making a list for a PC build. I used a danish site called edbpriser.dk
It's kinda like pcpartpicker.com. So i was going shopping for some parts and added them to a list.
Start with the motherboard. Find a motherboard with a modern socket and question every single spec you see in the specification and research the ones you don't know of or fully understand. Then move on to the next part. That's how i got most of me basic knowledge about hardware. And it's fun too.
Make a list for a totally overkill PC.