Step by step Android Tutorial?

New to Syncthing completely confused after watching How To Videos on YouTube.

Looking for usage tutorials

I want to sync the photos I have on 2 Android Tablets to 2 laptops running Linux Mint to 3 desktop computers running Linux mint I want Desktop computer #1 to be the master meaning if I want to delete photos off all the devices I will do so from Desktop #1 .

Suggestions?

Thanks in adcance.