What is the standard on always showing/not-showing second level navigation?

1. What do you see in the navigation menu?
2. How many items in a navigation menu?

What do you see in the navigation menu?

What is a navigation menu? On a website, a navigation menu is an organized list of links to other web pages, usually internal pages. Navigation menus appear most commonly in page headers or sidebars across a website, allowing visitors to quickly access the most useful pages.

How many items in a navigation menu?

A good rule of thumb is to keep it to between three and six choices.