Navigation can be provided in several ways in blogs.
Menus are the standard way to provide visitor a way of seeing the content of your site and allowing them to move around. Menus can be displayed in your themes menu bar.
Links can guide your visitors to relevant sections of your site. they are automatically generated by menus, but can easily be added to posts and pages.
More visual navigation could be provided by linking images.
The Draw Attention plugin can create interactive images that can be used for linking.
The Display posts plugin is used to provide automatic lists of posts which can be visual if the posts or pages use featured images.
The Make theme used on this blog allows you to create set of links in a similar way as the Display Posts. We use the Make theme to create the different visual lists of pages on the Home page.