Whilst being employed, you may be given the opportunity to do some extra on the job training. This can help you learn how to improve in your current role, teach you new skills to take on additional responsibilities or help you manage other members of staff.
Often employees will be given the opportunity to go on a management course. These are very popular and many employers send their employees on these types of course if they have given them a role than requires them to take responsibility for other members of staff. A management course can help an employee understand how to speak to other members of the team in an authoritative but not confrontational way.
Very often you will not have to pay for on the job training as an employee, as it will either be in house or your employer will cover the cost of external training unless you have asked to go on the course in which case they may ask you for a contribution. Any training is always a good idea and will improve your productivity in a current job but can also look great on a CV should there come a time when you wish to leave.