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Step one: choose the feature that carries the product
List every capability you imagine, then pick the one a new visitor would pay attention to first. Test it with a sentence: this product helps who do what without what pain. Take a hypothetical shared-checklist app called Tiwot. Its many ideas include reminders, templates and reports, but the feature that carries the page is turning a messy chat message into a checklist in one tap. Everything else becomes supporting detail below the fold, so the headline, image and call to action all point at one promise.
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Step two: show the feature working, not described
Visitors trust what they can watch. For the checklist example, place a short looping demonstration near the top: a pasted message on the left and a tidy list appearing on the right. Add three lines beneath it covering who the feature is for, what input it takes and what the user receives. Avoid vague benefit language and avoid claims you cannot support with a real demonstration. If the product is not built yet, label the page as a concept and invite readers to join a waiting list rather than implying availability.
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Step three: add one action and one way to learn
Give the page a single main action, such as joining a trial list or opening a demo, and repeat it at the top and bottom. Then add a quiet way to measure understanding: ask new visitors to describe in a sentence what the product does. If their answers match your promise, the page works. If they mention the wrong feature, rewrite the headline before adding anything else. For the checklist example, revise until most respondents say it turns messages into lists, and only then expand to secondary features.