The View Menu is about the layout of your working window. There several layout options:
- Normal
- Web Layout
- Print Layout
- Reading Layout
- Outline
Those are better understood once tried, rather than explained. I find the Print layout the most suitable to work with, but this may be a question of personal preference.
The ruler (which defines your tabs, borders, and more) can be triggered on and off from this menu, as can the document map and thumbnails. To increase your "working space" on the screen, the "Full Screen" option is available, just above the Zoom row.
Another important feature of this menu is the "Toolbars", defining which "quick buttons" will be visible and accessible to you throughout your work.