However, if you want to connect an Xbox 360 controller to your PC, you can find instructions here.

If you just got a new Xbox controller, there are just a few steps to connect it to your console or PC. You'll be gaming in no time. To start the pairing process, turn on your controller by pressing ...

The Steam Deck is arguably one of the best handhelds out there, but if you want better controls, you might want to connect your Xbox controller.