While all steam games supports keyboard and mouse, I prefer to use the PS4 controller instead. The good news is that Steam supports PS4, Xbox, Nintendo Switch, and many more controllers natively. You can simply connect one to your computer using a USB cable or Bluetooth and start playing. However, you should always check if the game has controller support built-in to ensure that your game would work without much effort. You can also customize the controller to work in the Steam Client app so that you can easily navigate the interface and even launch different games. To customize the controller settings, navigate to Settings > Controller > General Controller Configuration > Choose your Controller > OK. Must Read: How to Use the PS4 Controller Touchpad on PC with DS4Windows?