Manage User control and what changes they have done, as well as when to get notifications, & who will be notified, that should be managed by ACL tools in aem.
You can use database triggers also.
Please check and learn.
Yours,
Makrand
+91 9930102832
You have to edit the template, of page 3, and change properties and components as required.
Another option is to replace the index with page 3.
Yours
Makrand