Bistro is a child theme of Sydney. To see the documentation for Sydney (which also applies for Bistro), please follow this link.
The only specific aspect to Bistro is its integration with the Restaurant plugin. You must install this plugin to be able to achieve something like our demo site.
After you get familiar with Sydney, here's a summary of what you need to do for Bistro:
- install the Restaurant plugin;
- create menu items from your admin area and group them in tags if you need;
- add the menu specific widgets in the Page builder or link to their archive pages.