How Do You Start Writing a Professional Biography

I’m looking for guidance on writing a professional biography and wondering how to make it concise yet impactful. What key information should be included to showcase expertise without overwhelming readers? Are there common structures or formats that work best for LinkedIn, websites, or portfolios? I’d love tips from professionals who have crafted strong bios. How do you balance personal achievements, career highlights, and personality to create a biography that stands out and feels authentic?