This article explains how to use the autocorrect feature on your Android device and personalize your Android dictionary so you can avoid embarrassing mistakes. Instructions apply to devices running Android Pie (9), Oreo (8), or Nougat (7) from all manufacturers.
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On newer Android smartphones (except Samsung models), autocorrect is turned on and off on a per-app basis. You can find these settings here.
Go to Settings > System.
Tap Languages & input.