In addition to apps from unknown sources, they can also be installed directly from the Google Play Store. However, this requires a Google Account. These instructions show how to install them easily from the Play Store.

Android 10 (ColorOS 7.0)
Step 1:  Open the Google  Play Store
Step 2:  Tap on  Search bar
Step 3:  Search for the desired  app  and tap on the  result
Step 4:  Tap on  App  you want
Step 5:  Tap on  Install
  1. Open the Google Play Store
  2. Tap on Search bar
  3. Search for the desired app and tap on the result
  4. Tap on App you want
  5. Tap on Install

Oppo Instructions
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