How do you make a website with multiple pages?

Question

Do you have to make multiple html files? How does the file tree look or where do you put any other html files (if you do)

Answer 1

Or do you use javascript to simply change different components of the index html

Answer 2

Hey, @Echo One! There is a good wikia page on this topic: https://www.w3.org/wiki/Creating_multiple_pages_with_navigation_menus