If your are referring to the height of the fighter. You will want to keep the fighter at bay using your reach advantage staying outside and not coming in on the smaller fighter. The jab is usually a very good technique to use.
If you are referring to a smaller built quicker fighter and your are a larger stronger even slower fighter. This becomes more difficult you will want to bait your opponent setting up for your power hand. Working the jab to set up for the power shots avoiding being hit and focusing on counter punching.
I have seen some fighter in the amateurs even stiff arm keeping the smaller fighter outside.
