How do Implement matchmaking

How can I implement a multiplayer system with matchmaking and like multiplayer where its two people with controllers on the same computer

For Matchmaking, you’re going to have to build out your logic for your game specifically. There’s no out of the box solutions, although starting with the THNK framework will be your best bet:

For local multiplayer, check out the “Multiplayer platformer with Gamepads” example in the main example list within the engine, as it has that setup already.