Router > Controller > View > Template
URL based navigation. Main pages of the application
Controller > View > Template
Small elements that you need to insert into Template, but doesn't have any relation to the outlet. Like new post, modal views, ...etc.
View > Template
Creating reusable elements like post-item with actions, so you can use it in other Templates, but inherits the model from the main outlet.
Template
If you want a resuable UI element