EditText Example Android code

I'm new developer Android. Where I can find an Example of EditText ?? In XML please. I'm very stupid , i'm sorry. I tried this but doesn't work for me.

 <LinearLayout xmlns:android="http://ift.tt/nIICcg"
 xmlns:tools="http://ift.tt/LrGmb4"
 android:id="@+id/layout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"   
 android:orientation="vertical">
 <EditText 
    android:layout_width="fill_parent"
    android:layout_height="2dp"
    android:id="@+id/bus"
    android:hint="@string/hello_world"
    android:singleLine="true"
    android:inputType="textCapWords"/>
  </LinearLayout>

Bye Bye