Suggest an editImprove this articleRefine the answer for “What mistakes are most commonly made in on-page optimization?”. Your changes go to moderation before they’re published.Approval requiredContentWhat you’re changing🇺🇸EN🇺🇦UAPreviewTitle (EN)Short answer (EN)The most common and critical mistakes in on-page optimization are missing or duplicated `<title>` and `<h1>`, keyword stuffing, weak text structure, identical meta descriptions across pages, mobile-first adaptation problems, missing alt tags, and broken links. **Key point:** even small on-page mistakes can cost a large loss of rankings, so it's better to first build a clean and solid foundation.Shown above the full answer for quick recall.Answer (EN)ImageHere are the most common and critical mistakes in on-page optimization, the ones that make a site **lose traffic, rankings, and search engine trust**: --- ### 1. **Missing or duplicated** `<title>` **and** `<h1>` - No page title, or it matches other pages - `<h1>` is either missing or repeated on every page **Result:** the search engine doesn't understand what the page is specifically about, and lowers its significance --- ### 2. **Keyword stuffing** - The key phrase is inserted into every other paragraph - It's obvious it was written "for the bot" **Result:** readability worsens, and algorithms (especially Google) penalize over-optimization --- ### 3. **Weak text structure** - No subheadings, everything in one block - It's unclear where the topic starts and where it ends **Result:** the user leaves, and the search engine records poor behavioral signals --- ### 4. **Identical meta descriptions on all pages** - The `meta description` is copied - Or not set at all **Result:** click-through rate (CTR) in the results drops, it's unclear what to expect from the page --- ### 5. **Mobile-first adaptation problems** - The page looks good on desktop but falls apart on a phone **Result:** negative UX -> poor Core Web Vitals scores -> a drop in ranking --- ### 6. **No alt tags on images** - The search engine can't understand what's in the picture - People with disabilities can't perceive the content **Result:** missed opportunities and accessibility problems --- ### 7. **Broken internal links or an excess of external ones** - Pages lead to 404 - Or all links go outward without attributes (`nofollow`) **Result:** poor crawling and a leak of SEO weight --- **Conclusion:** Even small on-page mistakes can cost a **large loss of rankings**. It's better not to chase trendy tricks, but to first **cleanly and properly build the foundation**: structure, headings, semantics, and content.For the reviewerNote to the moderator (optional)Visible only to the moderator. Helps review go faster.