I want to show Recent Post (from all subdomain) with images Thumbnail at Front of my Main Site

Dearest WPMU Dev,

Here my Wordpress Multisite domain, http://www.Hidup.top.
I want to show Recent Post (from all subdomain) with images Thumbnail at Front of my Main Site .
But your tutorial is not complete, and make me so confused.

I want to make Site like a news Site, with some subdomain, and recent post from all subdomain will appear at front of my Main Site (Hidup.top)

Can you gimme a some complete tutorial how to put shortcode or some coding of recent post (with images thumb) from all subdomain at front of my theme main site ?

Gbu,