SEO Fundamentals Every Web Developer Should Know

SEO isn't just a marketing concern — developers control the parts that matter most: page speed, structured data, crawlability, and meta tags.

The Basics

Search engines crawl your HTML, index its content, and rank it against millions of other pages. Your job as a developer is to make sure they can read it correctly.

Meta Tags That Actually Matter

<title>Page Title — Keep Under 60 Chars</title>
<meta name="description" content="150–160 character summary that appears in search results.">
<meta property="og:image" content="https://example.com/og-image.jpg">
<link rel="canonical" href="https://example.com/the-real-url">

Core Web Vitals

Google uses three metrics to measure user experience:

• LCP (Largest Contentful Paint) — how fast the main content loads. Target: < 2.5s
• INP (Interaction to Next Paint) — responsiveness to input. Target: < 200ms
• CLS (Cumulative Layout Shift) — visual stability. Target: < 0.1

Structured Data

JSON-LD lets you annotate content so Google can show rich results (star ratings, FAQs, breadcrumbs).

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Article",
  "headline": "SEO Fundamentals for Developers",
  "author": { "@type": "Person", "name": "Your Name" }
}
</script>

Checklist

• Unique <title> and <meta description> on every page
• rel="canonical" on paginated or duplicate URLs
• Images have descriptive alt text
• Sitemap at /sitemap.xml
• robots.txt allows crawling
• No render-blocking scripts on critical path
• All pages score ≥ 90 on Lighthouse

Master these and you'll outrank 80% of competitors on technical SEO alone.