There are two ways of keeping in touch with what is new in the web site data.
The first is to use the What's New link under the Info drop-down menu. The number of days of changed data can vary - it is shown in the title: What's New (past XX days).
You may sometimes be puzzled as to what has changed. Even a minor change like correcting a spelling mistake or new link will mean that an item has been changed and will therefore end up in this list or the RSS feed (see below). But at least you are alerted to change!
Note that the changes notified are confined to People, Families and Media items.