The main components in a pc build are obviously a case which is where you actual pc parts go into. The other part is the motherboard it is where everything plugs into, the next important component is the cpu, the cpu or processor is the brain of the whole build if the cpu fries it would kill the whole build.

The other components like the ram, which is memory for your pc, or power supply which its name is self explanatory, and for gamers the most important part, the graphics card which makes you fps or frames per second better.