Grouping units a [number] GUI will float somewhere near them, so you might group all your air units and your ground units seperatly- You can tap 1 and you auto select all air units. Waypoints are where you select multiple spaces for the troop to move to, while holding a certain key to show the script that you want to set waypoints. Once you end setting waypoints the troops walk to the first one you selected then the second etc. It's for if you don't want to walk the default scripted way (SG said theres pathfin ding AI's) we might not want to walk the way the pathfinding wants us to. Waypoints would own.
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