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Managing Users on Linux systems is very easy.

Add Users

sudo adduser username – adds users
Additional profile information is not required, but a comment is a good idea.
Delete Users

sudo deluser username – deletes the user, but not the profile folder
sudo rm -rf /home/username – deletes profile folder
User Account File

vim /etc/passwd – allows you to view the user account file
Changing Passwords

passwd – changes your pasword
sudo passwd username – changes password for another account
Change User Profiles

sudo chfn username – changes profile information for user accounts.
Locking Accounts and Other Tasks

sudo usermod -option username – allows you make some additional changes to user account abilities such as locking and unlocking accounts.