Gradle missing resources. Android Studio Ver 3.0.1

Information:Gradle tasks [:app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar, :app:compileDebugAndroidTestSources, :app:compileDebugUnitTestSources, :app:compileDebugSources]
C:\Users\Yimage\.gradle\caches\transforms-1\files-1.1\appcompat-v7-28.0.0.aar\2db5fe45de7d7f443a1e900b0399be28\res\values-v28\values-v28.xml
Error:(9, 5) error: resource android:attr/dialogCornerRadius not found.
C:\Users\Yimage\.gradle\caches\transforms-1\files-1.1\appcompat-v7-28.0.0.aar\2db5fe45de7d7f443a1e900b0399be28\res\values\values.xml
Error:(1304, 5) error: resource android:attr/fontVariationSettings not found.
Error:(1304, 5) error: resource android:attr/ttcIndex not found.
C:\Users\Yimage\AndroidStudioProjects\Tutorial\app\build\intermediates\incremental\mergeDebugResources\merged.dir\values-v28\values-v28.xml
Error:(11) error: resource android:attr/dialogCornerRadius not found.
Error:(7) resource android:attr/dialogCornerRadius not found.
Error:(11) resource android:attr/dialogCornerRadius not found.
C:\Users\Yimage\AndroidStudioProjects\Tutorial\app\build\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml
Error:(518) resource android:attr/fontVariationSettings not found.
Error:(518) resource android:attr/ttcIndex not found.
Error:failed linking references.
Error:java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:java.util.concurrent.ExecutionException: com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:com.android.tools.aapt2.Aapt2Exception: AAPT2 error: check logs for details
Error:Execution failed for task ':app:processDebugResources'.
> Failed to execute aapt
Information:BUILD FAILED in 18s
Information:13 errors
Information:0 warnings
Information:See complete output in console

Please Help I am a beginner and just starting the app is hectic.