overcocking

What does it mean and refer to over clock a pc, what is it's purpose? all I now for now is that it's related to GHz

CPU OC led to black screen and VGA LED. So I decided to do a simple manual overclock so I headed into the BIOS and set my Ryzen 5 3600 to 4.0GHZ and putting the voltage to 1.250V and proceeded to save and restart(This was all I did). So after that all I got was a black screen and the only thing...

My build I'm looking to do just looking for information or advice out there about what graphics card to go for and overclocking potential Artic 750w gaming black Asrock b450m steel legend And ryzen5 2600x Kingspec m.2 512gb special Seagate Barracuda 4tb Gloway ddr4 8gbx2 3200 Amigo RGB 1200...