What is the best way to assign users to manage other users and computers in Active Directory?

Answer:

To help organize objects within a domain and minimize the number of domains you require, you can use organizational units, commonly known as OUs. OUs can be used to hold users, groups, computers, and other organizational units. See Figure 5-8. An organizational unit can only contain objects that are located in a domain. Although there are no restrictions on how many nested OUs (an OU inside of another OU) you can have, you should strive to design a shallow hierarchy for better performance.