Filling out the Services section tells Google what you offer and answers customer questions on your listing. Most profiles leave it half empty.
Your website and Google profile work as a team. The profile sends people to your site, and the site backs it up with matching details and proof.
Local SEO gets your business found by nearby customers in the map results. The big difference from regular SEO is location and your Google profile.
Treat Google Q and A as a public FAQ you control. Seed your own questions, answer clearly, and watch for wrong answers from the public.