What parts would you need to build your own computer?

you'd need the chasis, RAM (random access memory),ROM (read only memory),hard drive ,disk drive mother board,correct plugs for speakers,head phones, keyboard,mouse,etc, data cables for the drives, power cables for the drives,usb ports,ethernet ports,screen plug(don't know what that is called), power supply, and different plugs and cables for power and to connect different parts together.