Learning about functions of specific parts of PC

Today i have made some research about different parts of PC and what their functions are to make your computer work properly. Also when i was struggling to understand what some parts of PC are there for, i asked my brother to help me out and explain it. I learn't that each part of PC is there for to make everything work together to make sure it will work fine. All of the parts of PC are compatible and need to be there to make everything work fine.