Additional themes for Drupal 8 may be limited at first, but we can find prebuilt themes at several places. Some of these themes have to be purchased, whereas others are free to use. We will take a look at Drupal.org to find some prebuilt themes and how to install them using the Drupal admin, how to manually install a theme, and finally how to uninstall a theme once we're done using it.
Begin by opening up a new tab in our browser and navigating to https://drupal.org/project/project_theme.
The Download & Extend section of Drupal.org allows us to filter results based on various options. We can find Drupal 8-specific themes by performing the following steps: