How do I keep my PC cool while gaming?

How do I keep my PC cool while gaming?
System cooling 101: Ten easy ways to cool down a computer

Keep your system away from vents and windows.
Give your system some breathing room.
Close your system’s case.
Clean your fans.
Upgrade your CPU fan.
Add a case fan.
Add a memory cooling fan.
Check your system’s power supply fan.

System cooling 101: Ten easy ways to cool down a computer
  1. Keep your system away from vents and windows.
  2. Give your system some breathing room.
  3. Close your system’s case.
  4. Clean your fans.
  5. Upgrade your CPU fan.
  6. Add a case fan.
  7. Add a memory cooling fan.
  8. Check your system’s power supply fan.