I need to find which configuration file contains user account information such as login name, UID, GID, home directory location, and other account information. I typed more /etc/passwd but it only listed the user name, user ID, home directory locations but not the group ID & other account information. Please help me understand

As well as /etc/passwd you also have /etc/group.

Editing those directly can lead to disasters, but there are commands to make it safe: vipw and vigr (see their man pages). They load the file into the vi editor and check it after you've altered it: they won't save your alterations if you've made a mistake. If you don't like vi, then you can set them to use (e.g.) nano with export EDITOR=nano. You can also check the files for errors with the commands pwck and grpck.

There are also various commands (again, see the man pages) for doing things without editing the files directly: useradd, usermod, userdel, passwd, groupadd, groupmod, groupdel.

And of course there will be a users and groups management program in your desktop, which is usually the safest option.

Thank you for your help.

I don't want to edit, add/subtract or modify anything I just want to know which file contains them all.

I just typed man group, man passwd, man groupmod all separately. Is it safe to say there isn't a single command to find what I'm looking for but both the commands you stated /etc/passwd and /etc/group do this collectively?

That's right. Trying to combine them would lead to very complex commands! This is useful (even if you don't use Arch, their documentation is always good)
https://wiki.archlinux.org/index.php/Users_and_groups