10 Common SEO Mistakes and How to Fix Them

SEO is one of the most powerful channels for driving sustainable, long-term traffic to your website — but it is also one of the easiest to get wrong. Many site owners unknowingly make mistakes that quietly suppress their rankings, reduce crawl efficiency, and confuse search engines about what their pages are actually about. The frustrating part is that these errors often go unnoticed for months, silently costing you traffic and revenue.

In this guide, we walk through the 10 most common SEO mistakes — from technical oversights to content missteps — and explain exactly how to fix each one. Whether you are just starting out or have been running a site for years, auditing for these issues can unlock significant ranking improvements.

Mistake 1: Duplicate Content Across Pages

Duplicate content is one of the most widespread and damaging SEO mistakes. It occurs when the same or very similar content appears on multiple URLs — whether on your own site or copied from elsewhere. Google struggles to determine which version to rank, often splitting link equity between duplicates and ranking neither version well.

Common causes include HTTP vs HTTPS versions of pages, www vs non-www URLs, trailing slash variations, printer-friendly page versions, and product pages with multiple filter combinations generating unique URLs. The fix is to implement canonical tags pointing to the preferred version of each page, set up 301 redirects for duplicate URLs, and configure your CMS to avoid generating parameter-based duplicates.

Mistake 2: Missing or Poorly Written Meta Descriptions

Meta descriptions do not directly influence rankings, but they have a massive impact on click-through rate. A compelling meta description acts as an advertisement for your page in the search results — it is often the deciding factor in whether a user clicks your result or a competitor's. When meta descriptions are missing, Google auto-generates one, which is rarely as persuasive as a hand-crafted summary.

The fix is straightforward: write a unique meta description for every page, keeping it between 140 and 160 characters. Include your primary keyword naturally, highlight the key benefit or value proposition, and end with a subtle call to action. Use our meta tag generator to craft and preview your title tags and meta descriptions before publishing.

Mistake 3: Ignoring Image Alt Text

Images without alt text are invisible to search engines. Alt text serves two purposes: it tells Google what an image depicts (helping it appear in image search results), and it provides context to screen readers for visually impaired users. Skipping alt text means missing out on image search traffic and potentially failing accessibility standards.

Write descriptive alt text for every image on your site. Be specific — instead of "photo of a laptop", write "developer coding on a MacBook Pro with multiple browser tabs open". Include your target keyword where it fits naturally, but never stuff keywords into alt text. Decorative images that add no informational value should use an empty alt attribute (alt="") so screen readers skip them.

Mistake 4: Broken Internal and External Links

Broken links — both internal links pointing to deleted pages and external links pointing to moved or removed resources — create a poor user experience and waste crawl budget. When Googlebot follows a broken link and receives a 404 error, it wastes a crawl request that could have been used to index a valuable page. A high number of broken links can also signal to Google that a site is poorly maintained.

Audit your site regularly using tools like Screaming Frog, Ahrefs Site Audit, or Google Search Console's Coverage report. Fix broken internal links by updating them to point to the correct URL or setting up 301 redirects from the old URL. For broken external links, either update them to point to the new URL or remove the link entirely if the resource no longer exists.

Mistake 5: Keyword Stuffing and Over-Optimisation

Keyword stuffing — the practice of cramming a target keyword into a page as many times as possible — was an effective tactic in the early days of SEO. Today, it is a fast track to a Google penalty. Modern search algorithms are sophisticated enough to understand semantic context, so they reward pages that cover a topic comprehensively rather than pages that repeat a single phrase ad nauseam.

Aim for a keyword density of 1–2.5% for your primary keyword. Use related terms, synonyms, and semantically related phrases throughout your content to signal topical depth. Use our keyword density checker to measure how often your target keyword appears and ensure you are within the optimal range.

Mistake 6: Slow Page Load Speed

Page speed is a confirmed Google ranking factor for both desktop and mobile searches. More importantly, slow pages drive users away — research consistently shows that a one-second delay in page load time can reduce conversions by 7% and increase bounce rate significantly. Google's Core Web Vitals (LCP, FID/INP, and CLS) are now part of the ranking algorithm, making performance optimisation non-negotiable.

The most impactful speed improvements are: compressing and converting images to WebP format, enabling browser caching, minifying CSS and JavaScript, using a content delivery network (CDN), and eliminating render-blocking resources. Run your site through Google PageSpeed Insights or GTmetrix to identify your specific bottlenecks and prioritise fixes by impact.

Mistake 7: Neglecting Mobile Optimisation

Google uses mobile-first indexing, meaning it primarily uses the mobile version of your site for ranking and indexing. If your mobile experience is poor — with tiny text, unclickable buttons, horizontal scrolling, or content that differs from the desktop version — your rankings will suffer across all devices, not just mobile.

Use Google's Mobile-Friendly Test to check your pages. Ensure your site uses responsive design that adapts to all screen sizes, that tap targets are at least 48×48 pixels, that font sizes are readable without zooming, and that the same content is available on both mobile and desktop versions of your pages.

Mistake 8: Poor Internal Linking Structure

Internal links are one of the most underutilised SEO tools available. They help Google discover and crawl your pages, distribute link equity (PageRank) across your site, and signal the relative importance of different pages. A site with poor internal linking — where important pages are buried deep in the site structure or have no internal links pointing to them — will struggle to rank even if the content is excellent.

Build a deliberate internal linking strategy. Every new piece of content should link to at least 2–3 related pages on your site, and your most important pages (pillar content, money pages) should receive internal links from multiple other pages. Use descriptive anchor text that includes relevant keywords rather than generic phrases like "click here" or "read more".

Mistake 9: Not Using Structured Data

Structured data (schema markup) helps Google understand the content and context of your pages, enabling rich results in the SERPs — star ratings, FAQ dropdowns, recipe cards, event listings, and more. Rich results consistently achieve higher click-through rates than standard blue links, yet many site owners never implement schema markup.

At minimum, implement Article schema on blog posts, FAQ schema on pages with question-and-answer content, and BreadcrumbList schema for site navigation. Use Google's Rich Results Test to validate your markup before deploying. JSON-LD format (injected in a script tag) is Google's recommended implementation method and is the easiest to maintain.

Mistake 10: Ignoring Google Search Console Data

Google Search Console is a free tool that provides direct insight into how Google sees your site — which pages are indexed, which queries drive impressions and clicks, which pages have coverage errors, and which Core Web Vitals issues need attention. Ignoring this data means flying blind on your SEO performance and missing actionable signals that could improve your rankings quickly.

Set up Search Console for every site you manage and check it at least weekly. Pay particular attention to the Coverage report (for indexing errors), the Performance report (for queries where you rank on page 2 and could push to page 1 with minor improvements), and the Core Web Vitals report (for performance issues flagged by Google). Explore all the free SEO tools available at Mikdan Tools Blog to complement your Search Console workflow.

Conclusion: Fix These Mistakes and Watch Your Rankings Climb

The 10 SEO mistakes covered in this guide are responsible for a disproportionate share of ranking problems across the web. The good news is that most of them are fixable with a systematic audit and a clear action plan. Start by running a technical audit to identify duplicate content, broken links, and speed issues, then work through the content and structural improvements.

SEO is a long game, but fixing foundational errors delivers compounding returns. Each improvement you make builds on the last, creating a stronger, more crawlable, and more authoritative site that search engines are eager to rank. Prioritise the fixes with the highest potential impact for your specific site, track your progress in Search Console, and stay consistent — the results will follow.