10 Common SEO Mistakes (And How to Fix Them Today)

After analyzing thousands of websites with Seoggestion, we've identified patterns. The same SEO mistakes appear across industries, tech stacks, and experience levels. The good news: most of them take less than 5 minutes to fix.

1. Missing or Generic Title Tags

The most common mistake we see. Pages with titles like 'Home', 'Untitled', or just the brand name are leaving massive SEO value on the table.

Fix: Write a unique, keyword-rich title under 60 characters for every page. Use the formula: [Primary Keyword] — [Value Proposition] | [Brand].

2. No Meta Description

About 35% of the sites we analyze have pages without meta descriptions. Google will auto-generate one from your page content, but it's usually a random snippet that doesn't sell the click.

Fix: Write a compelling 150-160 character description for every indexable page. Think of it as a mini-ad for your content.

3. Missing Open Graph Image

Your link gets shared on LinkedIn, X, or Slack and it shows... nothing. No image. Just a bare URL or a tiny favicon. This kills click-through from social sharing.

Fix: Create a 1200x630px image for each page (or at least a default site-wide og:image). Tools like Canva, Figma, or even HTML-to-image services make this easy.

4. Title Tags That Are Too Long

Titles over 60 characters get truncated in search results with an ugly '...' Google sometimes rewrites them entirely. Either way, you lose control of your messaging.

Fix: Check every title with a character counter. Cut unnecessary words. Front-load the important keywords.

5. Duplicate Meta Tags Across Pages

When multiple pages share the same title or description, search engines struggle to differentiate them. This dilutes your ranking potential and can trigger duplicate content warnings.

Fix: Audit your entire site for duplicate meta tags. Each page should have a unique title and description that accurately reflects its specific content.

6. No Viewport Meta Tag

Without the viewport tag, mobile browsers render your site at desktop width and then shrink it. This makes text tiny, buttons un-tappable, and Google's mobile-first indexer very unhappy.

Fix: Add <meta name="viewport" content="width=device-width, initial-scale=1"> to your <head>. Every modern framework does this by default, but some custom sites still miss it.

7. HTTP Instead of HTTPS

It's 2026 and there are still sites running on HTTP. Browsers show 'Not Secure' warnings, Google has confirmed HTTPS as a ranking signal, and users simply don't trust unencrypted sites.

Fix: Get an SSL certificate (free with Let's Encrypt or Cloudflare) and redirect all HTTP traffic to HTTPS.

8. Ignoring Twitter/X Card Tags

Many sites set up Open Graph tags but forget Twitter Card tags. While X/Twitter can fall back to OG tags, having dedicated twitter:card, twitter:title, and twitter:image tags gives you more control over how your content appears on the platform.

Fix: Add twitter:card='summary_large_image' and twitter:title/description tags. They can mirror your OG values if the content is the same.

9. Not Setting a Canonical URL

If your page is accessible at multiple URLs (with/without www, with query parameters, with trailing slashes), search engines might index all variations separately, splitting your ranking signals.

Fix: Add a <link rel="canonical" href="your-preferred-url"> tag to every page. Most CMS platforms have a built-in canonical URL setting.

10. Not Testing After Changes

You fix your meta tags, push the update, and... never check if it actually worked. We've seen sites where the CMS overwrites custom meta tags, where build processes strip them out, or where caching serves the old version.

Fix: After every deployment that touches meta tags, run your URL through Seoggestion to verify the changes are live. It takes 10 seconds and prevents silent regressions.