Quotas, Usernames, Passwords, etc

[markerpower]

Where are the quotas, usernames, passwords, packages, etc located? Basically, I would like to know when I create a package and create an account where is this information stored?

[JawadArshad]

linux username and passwords are stored in /etc/passwd and /etc/shadow file respectively. The corresponding cPanel user's configuration files are stored in /var/cpanel/users/ and /var/cpanel/userdata/ folders. The cPanel packages are stored in /var/cpanel/packages. Diskquota of cPanel users is defined in /etc/quota.conf