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Micro is using your units to do more damage, recieve less. Lets say you have 5 skirms and the opponent has 5 pikes. You then use your skirms to fire at the pikes. Now you run away with your skirms while the pikes follow. you then shoot another pike and run again, you then shoot another one, and run, shoot and run and shoot and run and shoot and run etc. (You can also use Dragoons and dragoon-like units for it, its why people think Black riders are the strongest units.
Another one is retreating your unit to in your forts range so the enemy get shot by it giving you the advantage.
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No matter what you say