Menus, as the name suggest, helps a wordpress website in navigation. It means that they can be custom- links, pages or categories that you can place on an area within your blog. These help users in navigating your site. And due to this reason, some people also refer to them as ‘Navigation Menus’. They can be located beneath header-bar, above header, in footer or in sidebar too.
Updating your wordpress posts on regular basis is good, both in terms of SEO and the engagement of your readers with your blog. It’s not always true that whenever you publish any article, its complete one in terms of knowledge, depth and worth. As you keep on learning, you come to know new things; which you want to add in your old article.