use the inbuilt joystick to move and tap stuff to hit/mine them
to collect resources move over them and to craft stuff press the hammer on the left side
to open your inventory press the 8 dots on the left
to change your Hotbar click on the item then select the slot to put it in
to craft items first make sure you have the correct amount and the correct item then press the plus button your item will be dropped on the ground
to trash items tap an item then press the x