When we create a Custom List in SharePoint site, By default 5 columns are added to custom list which are
- Title (Single line of text) - Mandatory field that defines a title for each list item.
- Created (Date and Time) - When the user has created the current item.
- Modified (Date and Time) - When the last user has modified the current item.
- Created By (Person or Group) - User who created the current item.
- Modified By (Person or Group) - User who last modified the current item.
We can modify the column properties by clicking on Column Name from List Settings.