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The Flipper Zero has an app store now
(www.theverge.com)
This is a most excellent place for technology news and articles.
Depends on the device. But generally you put the flipper into capture mode, then run an action on whatever you want to capture (i.e. press a button on the remote). If its IR you have to aim it at the flipper, if its sub-ghz you just hold the two near enough.