Create a content item through core's node form: open /node/add/<type>, fill the title field (#edit-title-0-value, the id Form API derives from the base field's machine name and delta) and save. The saved item is remembered as "the content item I created" for the view, edit and delete steps.
Examples
When I create an "article" content item titled "Release notes"
And we create a "page" content item titled "About us"
When create an "article" node titled "Hello world"
And I create a "basic_page" content item with title "Terms"
When we create an "event" node with title "Launch party"
Pattern
When(/^(I |we )*create an? "([^"]*)?" (?:content item|node) (?:titled|with title) "([^"]*)?"$/, …)
Part of @webship-js/drupal-core-steps (github.com/webship/drupal-core-steps), a step pack for Webship-js 2.0.x.