Your standard post level 6 trade is to Q while attached, then after it lands R. Use W to leave your ally to help aim your ult so that it roots your primary target or other enemies, then once R is over AA then W.
Taunt the opposition with an emote of your choice, W an ally and heal them with E while using your emote again.
While detached and looking to save your ally, Q from behind them then instantly W to them and R your target.
When looking for a quick combo to save an ally AA then instantly W to them, Q and R.
For a quick poke trade while detached, Q then instantly AA and W back to your ally as soon as possible.
To perform your standard poke combo while attached to an ally Q your target. W to detach and AA, then instantly W back after.
Your super basic trade is to AA then instantly W an ally.