As morgana, When ganking, if Morgana misses her Q, she is basically useless and the gank will fail. This makes it important for you to land your Q.

If you don’t use your E correctly when fighting or in team fights, you’re going to get killed (or your allies will get killed). 

Aiming your Q around the minion wave can be hard. The way you counter this is by getting as close to the enemy as possible, and throw it out when they’re away from the minion wave. As morgana, When Morgana gets tired, if she misses her Q, she's basically useless and the gank will fail. This makes it important for you to pose your Q. If you don't use your E correctly during fighting or in team fighting, you will get killed (or your allies will get killed).