If you own a PS4 controller you can use it on your Steam too! First check your PC Bluetooth is on (to use it wirelessly). Then go to setting and devices, then select Add Bluetooth or other devices. To pair your PS4 controller device hold down the PS button on your controller and the share button, when the light bar on the controller starts flashing it's ready to be paired. Select “wireless controller” and look for the “device ready” message. Finally, go to Steam settings, select the box for Playstation configuration support, finally just customize your controller.