I’m talking about this: https://gamedevbeginner.com/input-in-unity-made-easy-complete-guide-to-the-new-system/
Also, WASD works, but on AZERTY or other keyboards for example, it’s not very convenient.
Here’s an image of the keyboard, as you can see it’s difficult to move around:
The new input system makes it easy to map it, so you don’t have more work to do for more players to enjoy your game 🙂