I know this is a beginner\'s question, but I\'ve been searching online and all I can find are \"free website templates\" that I can download.
The question is: How can I
You are describing server side includes.
Server Side Includes are useful for including a common piece of code throughout a site, such as a page header, a page footer and a navigation menu.
Example of usage:
This will add the text of quote.txt
to the page - if you add it to multiple pages, you can make your change in this one file and it will show on all pages in was included in.
Different web servers have different support and additional features for these, so you need to check the documentation for yours.
Many websites that need dynamic features (like fetching data from a database) will use some kind of server side scripting language for this kind of functionality - examples include PHP, Perl, ASP.NET, JSP and many more.