Control groups (Ctrl + number) let you command units and buildings without looking for them on screen. Using them well frees attention for macro and information.
A simple layout
- 1–3: army.
- 4–5: production buildings.
- One fixed key for your main base.
The exact layout matters less than always using the same one, so it becomes automatic.
To practice
The Your command center routine guides you step by step. Play it against the AI until you don't have to think about the keys.