Looking for good tutorial on sharing a database

Use case: you have your own WP site and I have my own WP site. We need a plugin that allows us to see and update data from the same db. If I make an update to the db through my copy of the plug-in on my page, that data needs to appear on your copy of the plugin on your site, and vice-versa.

I need to develop my own custom plugin for this.

Can anybody suggest a tutorial for that, or at least give me terms to Google? Thank you in advance!

 

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