By two ways, we can categorize the site columns. One is based on the field type and another is based on groups. During the creation of Site Columns, the creation page asks the admin to choose an existing group or create a new group.
SharePoint Foundation 2013 has the default column groups that are used under the Sites are listed below:
- Base Columns
- Core Contact and Calendar Columns
- Core Document Columns
- Core Task and Issue Columns
- Custom Columns
- Extended Columns
- _Hidden
- Picture Columns