Smoll promotes looking for positive things and reinforcing them. He found that reinforcement, sincerely given, didn't spoil the child, but rather, it gave them something to strive for. However, a coach should focus on effort rather than the end result. This means to do the best you can do. You made that effort.
Many people tend to focus on the negative side of mistakes.
We consider them to be bad and should be avoided at all costs. But mistakes do have a positive side. They provide the information we need to improve performance and are important stepping stones to achievement. If coaches can convey this idea to young athletes, they can help them to accept and learn from their mistakes. A positive coach always encourages their players to do their best.