Here I'm not going to talk about how to install Domain Service in your server or How to interact with Active Directory Users and Computers application. I'm going to make some simple note how to add users in a domain and how to add that users in to different groups.
add a user in Domain Controller.
command:
dsadd user "cn=firday, cn=users, dc=week, dc=local" -pwd Friday@123 -disabled no
This will add the user "friday" in "users" container on "week" domain. The password is going to be "Friday@123". "-disabled no" option will enable the user account.
Change password of the user.
dsmod user "cn=firday, cn=users, dc=week, dc=local" -pwd abc@123
In this case we are changing the previous user's password to "abc@123"
Add a user to an Admin group.
There may be several admin groups in your domain like itadmin, domain admin, built-in administrators ...