Nintendo Switch: How To Sync Joy-Con Controllers
The Nintendo Switch utilizes several different control methods, but your main input devices will likely be the Joy-Con controllers, which come with the system and can be either mounted to either side of the Nintendo Switch screen or detached for use in games much like the Wii Remote and Nunchuk controller.
Nintendo Switch Joy-Cons: How to pair Joy-Con controllers with the Nintendo Switch
When you take your Joy-Con controllers out of the box, simply slide them into place on both sides of your Nintendo Switch unit. It's not difficult to figure out which side goes where -- just align both Joy-Cons correctly and snap them into place. They should sync properly shortly. You'll see the green lights on the Joy-Con controllers flash if you've done this correctly.
Alternatively, go over to the Controllers menu section in the Settings menu on the home screen of your Nintendo Switch.
Nintendo Switch Joy-Cons: How to pair the Pro Controller with the Nintendo Switch
If you’re using the Pro Controller with your Nintendo Switch, make sure you have the Pro Controller linked to your Nintendo Switch dock. Alternatively you can use a USB Type-C cable to make sure there’s a physical connection. Then go to the Change Grip/Order menu and press the Sync button on the Pro Controller.
Voila! You’re done, and you’re ready to now play with your Nintendo Switch.