Clarification how to use view_cell, layouts or views

All three ways work. .... t. Especially since you can easily cache those views so you don't have to hit the database at all.

The only real benefit to using $this->renderSection() and the others is to allow for templates that can be shared among all of your page views for different page layouts (like homepage, two-column, three-column, admin, etc).

Hello
cache sounds great

can you kindly hint how to enable the cacheing of such a view cell?
Or it will got cached automatically?

Also: Navigation bar has much sense in a layout template or as cell to be called from the main template file? For readability could be, but is there something to consider about such approach? Pro / Cons

Thank you