Small set of further questions and forgive me for being an idiot but...

Question 0: how to use github? Is there a simple way like an "github appstore"? How do I know the github stuff is " legit"?

Question 1: I downloaded the zap.store via the apk (don't understand github option) and of course didn't check the hash (there are some command prompt items in the description, how to do that on a phone?

Question 2: it shows me updates available for a set of apps that are not available (yet?) On the regular play store orfdroidd or thebaurora store....

Well i think this thread is educational for how the new ones to this environment get confused by the non spoon fed solutions and alternatives to the conglomerates (google apple meta Microsoft)

Lots of kickups where people might give up... So thank you for your time and explanations