Be consistent with your approach. Kids make mistakes. We help & support them. Next day we start all over again repeating the same messages.
One thing that I have consistently heard as the most important characteristic for a Tennis Coach when I have interviewed more accomplished or experienced coaches than myself is that a Tennis Coach needs to be PATIENT.
The complexity of the game ensures that it’s going to take a lot of purpose full training even to get the basics right, so we better be consistent with our approaches & stay patient with the players.