Changing API level Android Studio(3.6.3)

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1) Change SDK API Level in Android Studio

  Step 1: Open your Android Studio, and go to Menu. File >  Project Structure.

  Step 2: In project Structure window, select  Modules in the list given on left side.
             Change the Compile SDK Version(29) and Build Tool Version to (29.0.3) and above.
  Step 3: In the same window select the Default Config tab and under this you will have an option
             for setting “Min Sdk Version” and for setting “Target Sdk Version”.
  Step 4 : Click Ok and Sync your Gradle.

2) To Change API using build.gradle (app level) in Android Studio
Step 1: if you are project is opened in android option then select open Gradle Scripts > build.gradle(Module: app/mobile)
Step 2: Open the build.gradle and go to Android and set CompileSDKVersion/BuildToolVersion
             and defaultConfig (minSdkVersion/targetSdkVersion)
Step 3: Click on Sync Now.

PS.Suggestions:  need to be updated if exists .(if  errors happened)