Discuss with a supervisor, co-worker or someone you know about the four major functions of management. Ask them which of the four is the most useful to them and report your findings. 
Book reference:
 Bauer, T., Erdogan, B., & Short, J. (2019). Principles of management (4th ed). Boston, MA: Flatworld. ISBN:  9781453392102.  
 Faulhaber, J. (2008). A Biblical approach to developing the inner qualities of a leader. Bloomington, IN: Xlibris. ISBN:  9781436341806.