Making a SiteMap for your website is extremely important as all of your Joomla articles, pages, etc. will be listed in there. Search engines will get all of your content from there to make sure they don’t skip an important page on any of the subjects you have created.
There are a lot of Joomla extensions for generating a SiteMap automatically and our recommendation is to try the xmap extension.
More details on how to install extensions onto your Joomla can be found HERE.