Before making your website publicly available on the Internet, you probably will want to build and test it in an offline environment.
Installing Drupal 8
This guide covers preparing for installation, running the installation script, and the steps that should be done after the installation script has completed. It also explains how to do a "multi-site" installation, where a number of different Drupal sites run off the same code base.
This documentation focuses on performing tasks at the command line. For information on using graphical tools, see the documentation that accompanies the application or is provided by your hosting service. Some web hosting companies also offer "one-click" installations of Drupal, or specific Drupal support.