Pop-Ups and Aggressive Ads and ModJoy: A Guide for First-Time APK Users

https://blogfreely.net/tothieilnr/package-signatures-and-modjoy-a-guide-for-first-time-apk-users

The first time you install an APK outside a normal app store can feel unfamiliar, so a clear routine helps. That idea is especially useful when you are comparing Android app files and versions