Webwash, a blog dedicated to learning development "the Drupal way" has created a two part tutorial delving further into what can be done with WebForms.

Part 1 covers the steps of getting started, exploring the interface, and setting up a straightforward form including email handlers.

Part 2 goes further, exploring multipage forms, previewing submission pages, conditional logic, displaying your form under a different URL for readability, attaching a webform to a page, displaying a webform as a block, creating layouts, and even more features.