If you’re like most people new to Unix, you do everything as root. You shouldn’t. I know I don’t follow my own advice, but I’m trying to improve.
Create yourself another account. Use that instead of root. Unless you really need root. You can always invoke su to become a super user. That way, you don’t have to log out and back in every time you need the power.
This adds the user marc to the wheel group.
bash-2.02$ su Password: su-2.02#
At the password prompt, supply the root password.
Note that you might also want to use either the -l or the -m options. Respectively, these options will simulate a full login or leave the environment unmodified. see man su for details.