How to set Unity for android development?

I am using unity 2019 LTS version to build a Vuforia supported AR app. When I build for android, I get “Failed to merge manifest” error, so I tried this(

Last Error Message : "UnityEditor.BuildPlayerWindow+BuildMethodException: 65 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002bb] in :0
at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in :0
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
"

I am using windows 10 and latest android studio with all platforms from Android 4.0 to Android 11(API level 30)

problem fixed here : Unity 2020 Android Support: Setup, SDK & NDK & JDK & Gradle - YouTube

Hello, oyu can download android studio and download from there all NDK versions, but the required NDK for the unity version you can simply go to Unity Hub locate your unity version, click on the three dots menu and add modules, expand Android modules and install the Android SDK and NDK from there, then in the unity preference go to external tools and select in the NDK path the unity recommended path