title: What is the difference between StoreModule.forRoot() and StoreModule.forFeature()
body: <p>Recently ngrx store changed the way to register the store variables in an angular application.</p>
  
  <p>What is the difference between StoreModule.forRoot() and StoreModule.forFeature()</p>
  
  <p>Do we need to register both to make the application work?</p>