hello, where to put gravity on? thanks
You can toggle the gravity on any rigidbody of an object by making that object active in the hierarchy, then adjusting the properties of it’s rigidbody. For 2D objects, you use rigidbody2D as opposed to just a rigidbody. You can make global changes to your game and adjust the gravity and velocity related physics by going to Edit>ProjectSettings>Physics2DSettings.
thank you very much
how can i make the person move??
A complete tutorial and the answer to your question is found here: 2D movement is covered in this video-
thanks