Why technical mistakes matter more than most businesses realise

These eight mistakes appear in the majority of technical SEO audits we run for Mumbai businesses. None of them are obscure they are consistent, common, and consistently underdiagnosed.

Mistake 1: Blocking search engines with robots.txt

A robots.txt file that contains Disallow: / blocks Googlebot from crawling the entire site. This is appropriate for staging environments. It is catastrophic for live sites.

How it happens: The staging site correctly blocks search engines. When the site is launched, the robots.txt is copied from staging to production without updating it.

Fix: Visit yourdomain.com/robots.txt. If it contains Disallow: /, change it to Allow: / immediately. Submit an updated sitemap in Google Search Console and request a recrawl of the homepage.

Mistake 2: Missing or incorrect canonical tags

Every page needs a canonical tag. Without it, Google chooses its own canonical which may not be the URL you want to rank. With an incorrect canonical (pointing to the HTTP version, the www version when non-www is preferred, or a redirected URL), Google ignores the canonical and may exclude the page or choose a random variant.

Fix: Add a self-referencing canonical tag to every page. Ensure it matches your preferred URL exactly: protocol, domain variant, trailing slash convention.

Mistake 3: Missing XML sitemap or sitemap not submitted

Without an XML sitemap, Google discovers your pages only through following links. New pages may take weeks or months to be discovered. Pages with few internal links may never be discovered.

Fix: Generate a sitemap at yourdomain.com/sitemap.xml. Submit it in Google Search Console ? Sitemaps. Ensure it contains only canonical, indexable URLs.

Mistake 4: Duplicate title tags across pages

Multiple pages sharing the same title tag tell Google the pages have the same purpose. Google may choose to show only one in search results, or neither if it decides the duplication suggests thin content.

Fix: Every page must have a unique title tag that describes that specific page. Use your keyword + location/differentiator for service pages. Use your headline for blog posts.

Mistake 5: Missing alt text on images

Alt text is how Google understands what images depict. Missing alt text means Google ignores your images as content signals. Images that should contribute to page relevance for specific keywords do not.

Fix: Add descriptive alt text to every significant image. alt="technical seo audit process diagram for mumbai website" specific, descriptive, includes relevant keywords naturally.

Mistake 6: Slow LCP on mobile (above 4 seconds)

We covered this in the pillar post and in image optimisation for faster pages. LCP above 4 seconds is a confirmed ranking suppression factor and a significant user experience problem.

Quick diagnosis: PageSpeed Insights ? test your homepage on Mobile. If LCP is above 2.5 seconds, find the flagged resource in Opportunities and fix it.

Mistake 7: JavaScript-rendered content that Google cannot read

Sites built with React, Angular, or Vue.js may render content via JavaScript. If Google cannot execute the JavaScript (due to errors or execution timeout), it sees an empty page and does not index your content.

Fix: Implement Server-Side Rendering (SSR) for critical content pages, or use a pre-rendering service. Test by viewing your page source if all content is in the HTML, Google can read it. If the HTML is empty and content is injected by JavaScript, there may be a rendering problem.

Full guide: when to worry about JavaScript SEO.

Mistake 8: Orphaned pages with no internal links

A page that no other page on your site links to is an orphan. Google may discover it via sitemap but will rank it poorly because no internal links signal that this page is important or relevant within your content structure.

Fix: Every published page should have at least 2 3 internal links pointing to it from related pages. Check for orphans with Screaming Frog: crawl your site, then filter by "Inlinks" = 0.

Frequently asked questions

Which of these eight mistakes is most common? Missing or incorrect canonical tags and slow LCP from unoptimised images these appear in virtually every audit.

Can fixing these mistakes alone improve rankings significantly? Yes, if the content quality is already there. Technical fixes remove suppression effects, allowing good content to rank at its actual ceiling. Content that was previously on page 4 due to technical issues may move to page 1 2 after technical fixes.

How long does it take for Google to update rankings after technical fixes? Canonicals and indexability fixes: 1 3 weeks after Google recrawls. Core Web Vitals improvements: 4 8 weeks (field data collection period). Schema additions: 1 2 weeks for rich results to appear.