If you want to develop your people management skills, Sheila Scott maintains that the most useful course you could find and book onto will be an on going coaching or counselling skills course.
The habits of coaching and counselling teach you to hold back your own opinions or answers, and to ask enough questions to find out what is really going on, and what others can really do for themselves to solve problems or achieve more. The best coaching and counselling skills courses make you be coached/counselled, so you can feel for yourself how much more useful it is to be helped to work out the best answer to any problem or the best way to meet any opportunity – and this will make you a much better manager.