You have a powerful tool available to you with existing websites. Templates are pages that already have everything on them that is common to all the pages in a web site. Templates might contain a menu at the top or a set of graphics. One convention used in naming template files is to use the directory name. Some parts aren't so obvious, or visible for that matter.
Tags can have parameters in the open tag.
Web sites often use Templates to build lots of pages that all look the same. Using a template is a good way to make new pages for your site. You will need to read on in the tutorial though before you do this if a page does not already exist.