An example answers the questions that cost the most time: which order is right, how long a bullet point can be, and what an achievement sounds like in one sentence. Start with the example for your career stage — apprenticeship, entry level or experienced professional — and study its mechanics, not its content.
Never copy the phrasing word for word. Recruiting software and experienced recruiters recognise copied samples instantly, and your own facts will always be more convincing. Copy the pattern behind the phrasing instead: verb at the start, task in the middle, number at the end.