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The state of Playstore
(lemmy.dbzer0.com)
This is a most excellent place for technology news and articles.
You can go to their official website and download it - https://f-droid.org/
Personally I prefer to use fdroid through Droid-ify.
The system will prompt you to allow Fdroid to install apps as soon as you download something the first time. Can't miss it
Otherwise, you'll find it under
Settings > Apps > Fdroid > installation of unkown apps
(or something like that, my system isn't in english)