What about ‘how to use [common unit/unit type] general tips, and focusing on some of the more common of the ‘harder for new player to use well’ units?
As examples of the sort of things Im thinking:
auroras - my assumption (but I hardly ever use them outside of my AI because I find them difficult) is they need a land scout to get the most from their range, should be given attack move orders to advance (so they dont get too close to the enemy), and should try and move away from the enemy to kite them if the enemy is advancing, with a new player tip being that as they have hover you should avoid reissuing move orders frequently as hover units can often temporarily move forwards when told to move back.
Strat bombers would be another example - times when they’re good to build; needing to be far enough away when giving the attack order so they drop their bomb; how targeting the enemy air player’s t2 power (if unshielded and they dont have t3 air) can be effective with 1 early strat bomber; while more generally t2 mexes make good targets as they can be one-shot
mobile shields - i.e. clicking assist on a unit vs giving general move order as part of a wider selection vs formation move vs individually moving (im assuming the assist option is preferable for apm limited players)
Also whether the same approach is suggested for using deceivers