One of my favorite methods is to drag the page to be moved to the desired spot in the existing structure. This is also possible with hidden pages.

There are other methods that may be more useful in larger websites: cut & paste per page, cut & paste for many pages at once, various ways of sorting, creating redirects, moving down and up with buttons. However, these are fodder for a workout.

If a page is not hidden, the link to it will be shown in the new position in the navigation menu.

Copying is almost identical. It does require some extra actions, because you usually want a different page title and different content. Usually one copies to reuse the structure. However, I do not recommend copying quickly, it should be done deliberately.