Come up with a good headline.
A big idea that hints that here is something your reader really, really wants (and can get from you).
For example, you may be selling a SaaS accounting tool, but the big message is: "Peace. Of. Mind."
Explain in clear and simple words:
what your product does
for whom it does it.
clarify the big claim you made in the headline.
Tell the reader what to do next.