Life experience, playing experience and coaching experience may be the only way to truly understand the importance of this. Too many young coaches will fail in this area simply because they don’t have the experience. Keep in mind too that playing and coaching are two very different skills.
Understanding the mental stability of a child, let alone a HS, college or young professional, is key to a coach making a positive impact on a player and a team.
Inexperienced & experienced coaches, please take this to heart. You can not verbally insult, embarrass, belittle, berate and take your frustrations out on the players and expect them to remain confident. Expect them to remain motivated. Expect them to trust you.
That stud player on your team is just as mentally soft as any other kid his age. They are just kids and if you want to get the best out of them, and this goes for any age, you MUST help them believe. You MUST help them develop confidence. You MUST show them respect. You MUST be a compassionate leader and you MUST have their trust in moments of failure. They need to be able to fail with confidence knowing that their leader will have their back and be there to help them.
To become the best coach you can be, you need to become the best psychologist you can be.