Zerg Units has been featured few days ago and perhaps we need a explore the Zerg race a bit more detailed.
Drone, most commonly known as the worker unit. In-charge for gathering resources and minerals enable for you to operate and build armies. Zerg's unit Drone are usually morphed into buildings, turned into attacking units like rRoach, Hydralisk and etc.
Basic techniques to make your Drone work faster and gather more resources is to strategically build your buildings near the source of minerals. By this, you will shorten the distance to be traveled by your Drone unit.
|Zerg unit's Drone|
You might have some ideas and techniques how to make Zerg units dominant among the 2 other race namely Protoss units and Terran Units.