De-Essing. Read about controlling sibilance when someone sings or speaks and a great link to a fantastic doument on how to De-Ess and get rid of sibilance.

Compressor/Limiters. Learn about Compressor/Limiters and the some of the functions they have and why we use them.

Get Rid of Feedback Learn how to Prevent and Stop Live Sound from Feeding Back.

Work as a Sound Engineer. Read about how to get work as a Sound Engineer