Good players use build orders. Build orders are used so tanks can be made quickly.
Some players opt for the fast attack method, while others go for the mass army of tanks.
Build orders are simply a guide to which buildings need to be built and in what order so you can speed build tanks in a short time. These build orders are from some Top Global Dominance players. Just keep in mine this is only a general guideline to follow. As with anything, the more you play the more you'll learn what works best. Generally speaking, you should build an ore truck after you build five tanks in order to keep the money flowing.