What are the prime voltages associated beside the PC circuitry?

What are the prime voltages associated beside the PC circuitry?

3.3 Volt

5 Volt

12 Volt
12 Volt
12v, 5v and 3.3v
12 v for fan, disc drives, serial ports and printer ports

5 v for general logic, printer ports and USB

3.3 volts for processor, memory.

Also inside the power supply part up to a LETHAL 300 volts!