Services is a structured list of what you do, each service named, describable, priceable ('from $X'), and it feeds relevance matching AND the AI answers Google now generates about your business. Fill every real service, individually; this is among the highest-leverage fields on the profile.
Products displays visual cards (photo, name, price, link). Built for retail, but service businesses use it legitimately for packages: 'Maintenance Plan', 'Panel Upgrade', 'Seasonal Tune-Up'. Each card another storefront window in your profile.
Keep both truthful and current. These sections are exactly what Google's AI quotes when someone asks what you offer. Stale prices in the products cards become stale prices in AI answers about you.