At the end of the day ull beat ure opponent more so through movement and coordination of attacks rather than builds...
I personally like to move as much as possible to keep my opponent busy... Once ure gd enough at coordinating many units at once try turning ure main force like a clock hand around the enemy before u engage.
The less experienced players in response to this will often make a mistake/panic leaving u an opportunity to attack.
Dont be afraid to be agressive, but also show a level of patience and thought before doing anything rash...