en-US/about_bolt_project.help.txt

project
  A Bolt project is a directory that serves as the launching point for Bolt
  and allows you to create a shareable orchestration application. Projects
  typically include a project configuration file, an inventory file, and any
  content you use in your project workflow, such as tasks and plans.
   
  When you run Bolt, it runs in the context of a project. If the directory you
  run Bolt from is not a project, Bolt attempts to find a project by
  traversing the parent directories. If Bolt is unable to find a project, it
  runs from the default project, located at '~/.puppetlabs/bolt'.
   
  A directory is only considered a Bolt project when it has a project
  configuration file named 'bolt-project.yaml'. Bolt doesn't load project data
  and content, including inventory files, unless the data and content are part
  of a project.
 
Documentation
  https://pup.pt/bolt-projects
  https://pup.pt/bolt-project-reference