There are several ways to install Joomla!.
If you want to test Joomla! and you haven't purchased a domain yet, you can install Joomla! on your own computer (without your site appearing on the Internet), you can install it using the XAMPP package. You can also create a working website at demo.joomla.org, which is easy and well-supported.
If you want your site to be available on the Internet, make sure that you have an account on a web server. For most people this means signing up with a hosting company and purchasing a domain that will serve as your site's main address.
- Option One: One Click Installs. Many hosting companies offer "instant" installation of Joomla!. Follow the instructions your host provides for a one click install.
- Option Two: Conventional Installs. This method requires that you copy the Joomla! zip file to your hosting account, unzip, create a database, and then run the installation. Complete instructions can be found in Installation with further resources at the Joomla! Installation Resources page. This video takes you through the steps.
- Option Three: Demo Site. If you used the Demo Site, you can follow the instructions provided to back up and move the site to your existing host or establish a hosting account at the end of the free 30 day trial. (Note that the Joomla! Project receives a royalty if you choose paid hosting from that site.)
For support with installation, you can ask questions in the installation forum.