You can connect controllers to your Steam Deck in a variety of ways, depending on what controller and other accessories you have access to. The most straightforward method is plugging one directly into the single USB C port on the Steam Deck, but this requires a controller that supports a USB C connection — such as the Steam Controller — or a USB A to USB C adapter, such as this Anker adapter . This is fine if youre playing alone, but there much more you can do if you want multiple controllers...