And a leader is the link between organization and employee and is the person who leads the group, so he is the core of the team. But it is not easy for them to command a team to achieve objectives, due not only to internal but also external factors. There are so many challenges that leaders face, such as globalization and communication. However, these challenges could be addressed by leaders using the right way. And then, there are so many types of team managers they can choose, then according to the conditions of the organization to train the best type. Additionally, we also discuss the Human Relations Movement, what it is, who finds it, and how they do the research to find it. And this theory gives the leader a clear path on how you should go about making your team grow more