Need help with common web page information

Hi I'm a Newbie and need some help.

How can I create common information and have it included on each web page
without copying the code from one page to another?

Much like you would use a header and footer in a document, I want to be able
to include common information such as contact information and links which
are often at the bottom of each page on a web site.

If you have a page I could reference, that would be very helpful.  Thanks,

Linda Lee

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