That's what (chess.com)friends are for
Training games

I offer unrated training games as a coaching feature. There is no need for a separate account because unrated can be specified when a new challenge is created.
I send an unrated challenge to the player who purchases this service. One the game commences, I discuss my plans and encourage questions. Conversations can become quite extensive in the little chat box.
Hi All,
do people use the online chess feature to train with each other, e.g. use the chat feature to talk over moves they have just made or ones they are about to, or analyse an attack they are about to launce and work over the pitfalls together?
If not would anyone be willing to try it. To stop your rating being affected you could create a training account to use for this one purpose?