It requires a coach to have an understanding of the skills required of the position, a concept of what he wants the position played like and the ability to reinforce them. Supervised repetition is the setting for what works best for your needs. Whether it be making 15 extra minutes to go to goal in a team training session or pulling eight local keepers together for a regional training weekend, it's the time you're working with keepers to work on specific situations or skills. For the purposes of this tip, I just want to focus on coaching beginning keepers. In the ideal world, every team has a qualified keeper coach.
Reality says it can be anyone including the team's one and only coach.
Some leagues have been creative and arranged for a keeper coach to be shared among the league's teams. Whatever your scenario, my experience has been that you get the most success working with keepers by having a specific coach work with a group in controlled settings. By controlled settings I mean drills where you can focus on specific skills, giving keepers the opportunity to practice and master skills. It all sounds rather dry, but it shouldn't. Mastering skills should be fun.