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Step one: state the offer in plain words
Begin with a sentence a stranger could repeat. For an events app, a weak line says, live more fully. A stronger one says, find three good things to do in your city each week. Name the audience, the action and the payoff without metaphor. Test it by removing the brand name and checking whether the sentence still makes sense. If it does, you have a real offer. Keep the headline under about twelve words, and save atmosphere for the supporting line, where tone can show without hiding what the product actually does.
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Step two: add one proof of how it works
Under the headline, give a single concrete sentence about the mechanism. In the example, it might read: pick your neighbourhood, choose your mood, and get a short list you can share with friends. This answers the visitor's next question, which is how the thing works. Avoid claims about user numbers, savings or results unless you can document them. Use specific nouns such as list, calendar, invite or shortlist. Pair the line with an image or interface sketch that shows the actual experience, because a visual of the real product builds more trust than a generic lifestyle photograph.
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Step three: choose one clear next action
Finish the hero with a single button whose label describes the result, such as See this week's picks, rather than something vague like Get started. A secondary link may exist for people who want more detail, but it should not compete visually. Decide what happens after the click, since the hero promises something. In the example, the button leads to a city selector and then the first shortlist. Read the whole section aloud, ask whether a new visitor knows what is offered, and cut any word that does not support the promise, the proof or the action.