There are so many different ways to control silence/non-silence/vibrate, I have to admit I don't get it at all: - Main volume control - Ringers and alerts vol

There are so many different ways to control silence/non-silence/vibrate, I have to admit I don't get it at all: - Main volume control - Ringers and alerts volume control - switch on side of phone - Do Not Disturb mode - Sounds => Vibrate on Ring - Sounds => Vibrate on Silent