What can I make?

You can make basically everything. Your App should work on all trending Linux Mobile Distros (e.g.: Plasma Mobile, Postmarket OS...)

But Make sure your App is well accessible on Mobile (button size etc.)

What devices can I get?

PinePhone, PhinePhone Pro, Librem 5, PineTab, Librem 11, StarLite. And maybe more...

Who can participate?

Everybody from 13-18ys in middle- or highschool and member of hackclub