I don't know how to move in Terraria, I have tried tapping on the ground and scrolling but it doesn't work? Can anyone help me?
The movement keys are well described by Cyan. Should you have the mobile version: there are a couple of circles in the bottom left corner. Moving the blue cursor in any direction beyong the most inner circle will cause your character to move in that direction; the speed is depending on how far out you move your cursor. Jumping is the same thing.
It is definitely advisable to stick to PC with this game; touchscreen controls can be quite frustrating if you need to be precise, like in this game.
You can move using the W, A, S & D keys.
You can also find a list of all controls here.