There is a wealth of info available for Joomla. Templates, Components, Modules, Plugins..... Calendars, Forums, Bloggers, Newsletters, and tons of other contributions.
extensions.joomla.org


Also, there are Tutorials available for a good learning experience. Taking the time to run through some of the tutorials will save you tons of time later when you are trying to update your site. Joomla Tutorials


Need help? You can get incredible information at Joomla's Forums:
forum.joomla.org
Join the community, and you'll quickly absorb more info and tips you ever thought possible.