A strong brief starts with the audience and the decision they need to make. Define the problem, offer, evidence, objections, key action and the search intent that brought them to the page.
Give every important page one primary job. A homepage may orient visitors, a service page may explain fit and outcomes, and a landing page may support a campaign. Trying to make every page do everything usually weakens clarity.
Include practical inputs: page title, main heading, supporting sections, internal links, FAQ topics, proof, calls to action and measurement. This helps design and development work from the same strategy.
What to do next
Choose the one improvement most likely to reduce friction for a valuable user journey. Measure the result, learn from it and build from there.