main_nav_graph.xml

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            xmlns:tools="http://schemas.android.com/tools" 
            android:id="@+id/main_nav_graph"
            app:startDestination="@id/oneFragment">

    <fragment android:id="@+id/oneFragment"
              android:name="com.app.kotlinnavigation.OneFragment"
              android:label="fragment_one"
              tools:layout="@layout/fragment_one">
        <action android:id="@+id/action_oneFragment_to_twoFragment"
                app:destination="@id/twoFragment"/>
    </fragment>
    <fragment android:id="@+id/twoFragment"
              android:name="com.app.kotlinnavigation.TwoFragment"
              android:label="fragment_two"
              tools:layout="@layout/fragment_two">
        <action android:id="@+id/action_twoFragment_to_threeFragment"
                app:destination="@id/threeFragment"/>
    </fragment>
    <fragment android:id="@+id/threeFragment"
              android:name="com.app.kotlinnavigation.ThreeFragment"
              android:label="fragment_three"
              tools:layout="@layout/fragment_three">
        <action android:id="@+id/action_threeFragment_to_oneFragment"
                app:destination="@id/oneFragment"/>
    </fragment>
</navigation>