How not to do it: In order to complete a simple action I have to move the pointer from the far left to the far right, up and down and back again.
How to do it: Every screen has a purpose and shall be dedicated to a single action, more so on mobile than on the web. Obviously, you will have screens that will change only marginally depending on the users input or system output. Now, if a task does take more than a couple of clicks maintain a smooth, one directional path throughout the interaction. Strive for having a user move the pointer in one direction without her needing to go back and forth across the entire screen. Place the e.g. button or input field for the next interaction close the previous one. Keep moving that way.