One of the most important things to understand if you are operating any kind of sound desk whether in a live or studio environment is the Audio Signal Path.
It took me a good while to see the significance of understanding the signal path on the sound desk I was using. I thought that, because there was a button for everything, I could just wing it. I could always find what I wanted and away I went. Until it goes wrong, and you can’t understand why you’re not getting the results you want from the desk.