step 1: Connect the controller with your device

This is just as usual as connecting any bluetooth device or wired device depending on the type of controller you want to play with

step 2: Open the game and wait for it to detect controller

In the home screen you will notice the Controller cursor. And then you can alrady move it with your controller

step 3: Game will automatically show key mappings

In game settings you'll see the complete details on controller key mappings

Read the complete details here

Complete list of supported controllers for PC, Android, and iOS device are given. There are 50+ supported controllers. Check the link given down below!