https://targetsdk.com/
targetSdkVersion Requirements and API Levels | Android Dev
Android target API level requirements on Google Play Store explained (targetSdkVersion).
requirementsapilevelsandroiddev
https://developer.android.com/reference/tools/gradle-api/9.2/com/android/build/api/dsl/TargetSdkVersion
TargetSdkVersion | API reference | Android Developers
api referenceandroiddevelopers