What Thor means is that you simply make a page, and then copy the start of the page so that it is the same on all pages, you can do it however you like...
To make it easier/faster, you can put the code of the start of the page in a separate file and include that file in all your documents - that way, you only need to edit one file and the change will be visible on all pages.
Here is a pretty good article describing some ways of including files.
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