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Android's new developer verification rollout begins, sideloading changes are next
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
It's pretty easy to use, you just need a USB cable. But it is a cli like terminal so you do want to search for how to use it and not just guess because you can delete files accidentally easier. But you always just start with 'adb devices' and that just lets you know if it's working.