At this level, individuals have a basic understanding of what Postman is and its role in API testing. They are familiar with HTTP methods but may not yet be able to use Postman effectively. Their knowledge is largely theoretical at this stage.

Novices can install and setup Postman, send basic requests, and use pre-built collections. They understand how to create simple tests and save responses. However, their understanding of Postman's more advanced features may still be limited.

Intermediate users can create and manage environments, use variables and authorization helpers, and write more complex tests. They know how to use the collection runner and document APIs in Postman. They are comfortable using Postman for regular tasks.

Advanced users can use Newman, Postman's command line integration, and Postman's API. They understand how to use monitors and mock servers, and can use Postman for continuous integration. They are capable of handling more complex tasks and troubleshooting issues.

Experts have a deep understanding of all of Postman's features and can troubleshoot complex issues. They can customize Postman for specific needs and integrate it into a larger development workflow. They are also capable of teaching others how to use Postman effectively.