The /etc/group file is a text file that defines the groups and their members on the system. Each line in the file represents a single group, with the following format:
group_name:password:GID:user_list
The fields are:
* group_name: the name of the group
* password: the (encrypted) group password, or empty for no password
* GID: the numerical group ID
* user_list: a comma-separated list of users who belong to the group
Therefore, the fields that can be found in the /etc/group file are the name of the group, the password of the group, and the list of users that belong to the group. The home directory and the description of the group are not part of the /etc/group file format. References:
* group(5) - Linux manual page
* /etc/group file format | Linux#