Understanding the computer system is very simple. The computer is like the human body. It has internal organs like us thats basicly the mother board which is like our brain it also has its own skin which would be the case of the computer. Its also like us in the way that if one of the parts is failing the computer will either slow down or stop working which would be like getting very sick or dying
There are many pc parts but these are the ones I think are the important ones.
Power supply unit
RAM (random access memory)
Video card/Graphics Card
These are the main ones in my opinion. Go to the next page to see what they do!