Lightning Bolt solution comprises an exported community template that’s made up of a theme layout and CSS, along with pages, content layouts, and Lightning components. This tag is for issues related to exporting and distributing a customized template or page as a Lightning Bolt solution.
Use the Customer Service (Napili) template as a base to build your custom solution with standard pages and components, or create custom pages, layouts, and components of your own. After you’ve finished customizing the template, you can export it from the Developer section in the Settings area.
When you export a template, it appears in the Community Creation wizard in your org, where you can use it as a base for building new communities.
Lightning Bolt documentation can be found here.