The practical answer is you need exactly three meta tags that matter: a title tag, a meta description, and a viewport tag. The title tag (technically an HTML element, not a meta tag) is a direct ranking factor and should be 50-60 characters to avoid truncation in search results. The meta description doesn't affect rankings but drives click-through rate, so keep it 150-160 characters with a clear value proposition. The viewport tag ensures mobile rendering works correctly, which indirectly affects rankings through Core Web Vitals and user experience. Beyond these three, most meta tags are either ignored by Google or serve niche purposes. Meta keywords haven't influenced Google rankings since 2009. Open Graph tags (og:title, og:description, og:image) matter only if you care how links appear on Facebook or LinkedIn, not for search rankings. Twitter Card tags do the same for X/Twitter. Robots meta tags (noindex, nofollow) are critical when you need them but shouldn't appear on pages you want ranked. At Ottawa SEO, we see clients waste time adding meta author tags, meta copyright, geo-location tags, and other legacy elements that provide zero ranking benefit. The exception is Schema.org structured data, which technically uses a different implementation (JSON-LD script tags, not meta tags) but dramatically improves how Google understands and displays your content in rich results. The quality of your two core meta elements matters far more than quantity. A title tag stuffed with keywords performs worse than one written for humans with natural keyword placement. A meta description that reads like keyword soup gets ignored by users even if Google shows it. If you're building a standard business website, three essential tags plus Open Graph if you share content socially covers 95% of use cases. Anything beyond that should solve a specific technical problem, like canonical tags for duplicate content or hreflang for multi-language sites, not get added because a checklist said so.