@julian even for the last edit, It will be a great addition, if you can specify message ("what was changed or why edit was made, etc.").
Edit history is a bit overkill for general forum 😉

Hi,

Please provide enough details to implement below functionality :

I want to write one plugin which provides following functionality :
-Admin can assign user role as MODERATOR to any user, and Only User who have moderator role can approve Topic Creation and Comments/Reply.
-Any new Topic created by registered/guest user should not be visible on the website till MODERATOR User approved it.
-MODERATOR User will be able to see all the unapproved topics, reply/comments and approves it.
-How to implementing email notification functionality for MODERATOR User on New Topic Creation and on Replies/Comments ?

Any help would be greatly appreciated.
Thanks!!!

Hello there, we suggest you consolidate all of these points into a single email so they can be tracked properly. Thanks.

Specifically with moderator post approvals, this is not in the core functionality. It would be a custom plugin.