When in doubt, give it a go and see what happens. That's what I did...You just get some text as well as a numerical evaluation. Like this:
Coach mode

I tried two bots and other than appearance, they gave the same comments and lines.
The ability to change avatars is new and doesn't do anything else

Do the different coaches recommend different things/have different play styles?
No, it's just a visual change.

Do the different coaches recommend different things/have different play styles?
No, it's just a visual change.
Good to know. Would be cool if they did in future, kind of like the different bots.
i want to play against the coach computer which i have on my laptop but it doesnt show up on my pc, please help
When you goto https://www.chess.com/play/computer and then settings, what is coach mode? Don't see any difference after selecting it. Can't find the answer in google.
Thanks.