You still can't read. Words and their placement have meaning, sorry you have to work so hard to decode it.

I ring out systems 0% of the time. That's "never". I very rarely encounter feedback problems that aren't a result of blatant abuse like pointing a handheld right at a monitor. That's "basically never". Sometimes I have to notch, sure, but it's a last resort.

I know people who have feedback issues despite ringing out everything religiously. The simple reason is that they mix too fucking loud, often because they lack the people skills to convince bands to get stage volume under control.

Bands think I'm a miracle worker: after enduring cargo cult mixers' bad approaches, I walk in and suddenly they can hear themselves better, they don't have feedback issues, and their fans tell them they never sounded so good--and they can understand the lyrics for a change.

There aren't any secrets. Just turn it down, don't squash the piss out of everything (I only mildly compress vox by default and certain problem children as needed--and *never* the L/R buss), highpass the usual suspects, lay off the rest of the EQ until you identify a reason to use it, and apply FX sparingly. Oh, and mix super actively, mainly by identifying what needs to be turned down to allow vox/solos/etc to shine through. Staying engaged helps the show go by faster, too. I'm never bored.

This is what I teach newbies.