Every SE site has a tour page. This page exhibits various actual Q&A from the site.
On Lifehacks.SE, the tour uses one of my questions. Was this manually selected by somebody on the SE Community Team, or automatically?
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They are selected automatically, although the selection can be overridden by moderators - once a question becomes eligible to be on the tour page, the site moderators can select it.
The criteria (beyond score - ensuring it is a good question) are mostly about how it will display on the tour page - things like limited set of/no HTML elements and how short it and some of the answers are.
Your question met all the criteria and was selected automatically.