[AugustoCAS]

It's a good question!

Coaching is about helping people find their own answers. One needs to know about a topic when giving specific advice / guidance.

Having said that, for me building technology has 2 challenges: people and technology. Initially in my career I focused on the technical aspects of it (clean code, good design & architecture, etc) and later found the people challenge is a lot harder than the tech. I learn by researching topics so I read quite a lot about teams, management and lean. Then I pieced together what good and bad managers did and how that related to what I had read.

From my experience most managers (and product managers, engineers, etc) perform their work in the same way they learned from other people while doing their job and rarely do any research or go to the source to learn how to be good at what they do. They might be sent to a 2-5 days course on how to manage, but that's it. The knowledge they have is often from 2nd+ hand, and very diluted. If you fancy doing an experiment, grab a couple of managers and ask them what mix of managerial theory or practice they follow. Ask for names of authors and thought leaders. Ask for any book they have read in the last 6 months about good management. There's a big chance you won't get anything or something very fluffy. What I found is that one doesn't need to know a lot in order to make an impact, and going to the sources helps a lot.

About a nun being a sex therapist, I do know a few Buddhist monks and nuns who joke about how much relationship advice they are asked when they never had a romantic relationship or when they weren't very successful at them before being ordained.