A website can work perfectly for visitors while still having many SEO problems. A missing H1, poorly written meta tags, an incorrect canonical URL, invalid Schema.org data or pages that Google cannot index can all limit your visibility in search results.
The good news is that many of these problems can be identified and fixed systematically. This practical guide walks through the most common technical, structural and content-related SEO issues you should check on a website.
1. Start With a Proper SEO Audit
Before changing random tags or adding more keywords, identify what is actually wrong. The goal is not to make every page "perfect", but to understand why certain pages may be difficult for search engines to crawl, understand or index.
Missing H1 Less clear page structure Presence of a relevant H1 Missing title tag Weak page identification HTML title element Missing meta description Less control over search snippets Meta description Missing canonical Potential duplicate URL issues Canonical URL Missing Schema.org Less structured context for search engines Structured data Page not indexable Page may not appear in search results Robots, noindex and HTTP status Images without alt text Reduced accessibility and image context Alt attributes Broken links Poor user experience and inefficient crawling Internal and external links2. Check the Title Tag
The <title> tag is one of the first elements to review. It should clearly describe what the page is about and should not be identical across pages with different search intents.
Example to avoid:
<title>Home</title>More descriptive example:
<title>Custom Marketplace Development | Eloshon</title>Avoid automatically using the same title on every page. Important URLs should have unique titles that accurately describe their content.
Title missing Create a descriptive title Several pages have the same title Differentiate their search intent Title is too vague Describe the page more precisely Title is stuffed with keywords Rewrite it naturally3. Fix a Missing H1
A missing H1 is a common issue, especially on websites generated by page builders or custom applications. Another problem is using multiple H1 headings without a clear reason.
The H1 should normally communicate the main subject of the page. It does not need to be an exact copy of the title tag.
Less clear structure:
<h2>Our Services</h2> <h2>Marketplace Development</h2>Clearer structure:
<h1>Custom Marketplace Development</h1> <h2>A Marketplace Built Around Your Business</h2> <h2>Available Features</h2>The important point is that your heading hierarchy should reflect the actual structure of your content.
4. Optimize the Meta Description
A meta description is not, by itself, a direct ranking factor. However, it can influence how your page is presented in search results.
<meta name="description" content="Build a marketplace adapted to your business with booking, payments and user management." >Avoid generic descriptions such as "Welcome to our website." Instead, explain what the visitor will actually find on the page.
5. Add and Correct the Canonical Tag
The same content can sometimes be accessible through multiple URLs. This can happen because of URL parameters, technical variations or certain navigation structures.
A canonical tag helps indicate which URL should be considered the primary version of a page.
<link rel="canonical" href="https://www.example.com/marketplace-development" />A common mistake is placing the exact same canonical URL on every page. A contact page should not normally declare the services page as its canonical URL.
/ https://www.example.com/ /services https://www.example.com/services /contact https://www.example.com/contact6. Check Indexing Problems
Before trying to improve the ranking of a page, make sure search engines are actually allowed to index it.
Several things can prevent or complicate indexing:
- a noindex directive;
- an overly restrictive robots.txt file;
- a 404 or 500 HTTP response;
- incorrect redirects;
- content that only appears after user interaction;
- duplicate or very low-value pages;
- important pages with no internal links pointing to them.
Watch out for this directive:
<meta name="robots" content="noindex">If this tag is present intentionally, the page should not be treated as a page that you want indexed in search results.
7. Check Your robots.txt File
The robots.txt file provides crawling instructions to search engine robots.
User-agent: * Disallow: /admin/ Disallow: /private/ Sitemap: https://www.example.com/sitemap.xmlOne particularly damaging mistake is accidentally blocking public pages or resources required to properly render your website.
8. Check Your XML Sitemap
An XML sitemap helps search engines discover important URLs on your website. It does not replace a good internal linking structure.
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"> <url> <loc>https://www.example.com/services</loc> </url> <url> <loc>https://www.example.com/contact</loc> </url> </urlset>Check that your sitemap does not contain deleted, redirected, private or intentionally excluded pages.
9. Add Schema.org Structured Data
Structured data gives search engines organized information about the content of a page.
Depending on the page, structured data can describe an organization, local business, product, article, event, FAQ and other supported content types.
JSON-LD is a common way to implement structured data.
<script type="application/ld+json"> { "@context": "https://schema.org", "@type": "Organization", "name": "Example", "url": "https://www.example.com" } </script>The important rule is not to invent information in your structured data. The data should accurately represent information that is actually applicable to the page.
10. Rich Snippets: Avoid False Promises
Adding Schema.org markup does not automatically guarantee that Google will display a rich result for your page.
Structured data mainly helps communicate specific information to search engines in a standardized format. Whether an enhanced search result appears depends on search engine requirements and decisions.
Article Article Company Organization Local business LocalBusiness Product Product Event Event Eligible FAQ content FAQPage where applicable11. Check Your Internal Links
An important page should not be isolated from the rest of the website. Internal links help both visitors and search engines understand how your pages relate to each other.
Example:
<a href="/marketplace-development"> Custom Marketplace Development </a>Do not turn every internal link into an unnatural repetition of the same keyword. Anchor text should remain useful and natural.
12. Fix Broken Links and 404 Errors
Identify links that lead to pages that no longer exist. If an old URL has useful links or SEO value, a permanent redirect to a relevant replacement page may be appropriate.
Old URL ↓ 301 Redirect ↓ Relevant new URLHowever, avoid redirecting every deleted URL to the homepage when the content is unrelated. A redirect should lead to a logical destination.
13. Optimize Your Images
Large images can slow down a website unnecessarily. Images should also use meaningful alternative text when that text provides useful information.
<img src="/images/massage-table.webp" alt="Folding massage table" />The alt attribute should describe the image when appropriate. Do not fill it with a long list of keywords simply to try to manipulate search rankings.
14. Check Performance and Core Web Vitals
An SEO-friendly website should not only be understandable to search engines. It should also provide a good experience for visitors.
Check mobile performance, image loading, unnecessary scripts, render-blocking resources and visual stability.
Very large images Compression and modern image formats Too much JavaScript Remove or defer unnecessary scripts Too many font variants Reduce the number of loaded variants Content shifts while loading Reserve space for visual elements15. Check Your URLs
A simple URL makes it easier to understand what a page is about.
/page?id=87452 /marketplace-development /services/page123 /beauty-services /blog/article-4587 /blog/seo-guide-marketplaceA good URL does not need to be long. It should be stable, readable and consistent with the content of the page.
16. Deal With Duplicate Content
Two URLs containing substantially similar content can create unnecessary duplication within a website.
Duplicate URLs can be caused by URL parameters, technical versions of a page, category structures or automatically generated pages.
Depending on the situation, the appropriate solution could be a canonical tag, a redirect, improved unique content, merging pages or excluding a page that should not be indexed.
17. Check Open Graph and Social Metadata
Open Graph primarily controls how your URLs appear when shared on social networks. Although it is not a traditional Google ranking mechanism, it is useful for controlling the appearance of shared pages.
<meta property="og:title" content="Custom Marketplace Development"> <meta property="og:description" content="A marketplace adapted to your business."> <meta property="og:type" content="website"> <meta property="og:url" content="https://www.example.com/marketplace-development"> <meta property="og:image" content="https://www.example.com/images/marketplace.jpg">18. Check Multilingual SEO
Multilingual websites have additional SEO considerations. Avoid mixing languages within the same page and make sure different language versions are correctly connected.
hreflang annotations can be used when equivalent language or regional versions of a page exist.
<link rel="alternate" hreflang="en" href="https://www.example.com/en/services"> <link rel="alternate" hreflang="fr" href="https://www.example.com/fr/services"> <link rel="alternate" hreflang="nl" href="https://www.example.com/nl/services">Each version should point to the correct corresponding versions.
19. Check Important Business Information
For a professional website, make sure important business information is consistent wherever it appears: company name, contact details, phone number, address where relevant, domain and official profiles.
Consistency can be particularly important for businesses that rely on local search visibility.
20. Do Not Forget the "Secondary" Pages
SEO problems are not always found on the homepage. Also review service pages, category pages, product pages, blog posts, local landing pages, contact pages and dynamically generated pages.
Homepage Title, H1, description, content, Schema Service page Search intent, content, H1, internal links Article Title, Article Schema, author, dates, images Product Product Schema, price, availability, content Contact page Business information and contact details Local page Location, unique content, local information21. SEO Checklist Before You Finish
Use this checklist after making significant SEO changes:
- ☐ The page has a relevant title tag.
- ☐ The meta description is present and descriptive.
- ☐ The page has a clear H1.
- ☐ H2 and H3 headings follow a logical structure.
- ☐ The URL is clean and understandable.
- ☐ The canonical points to the correct URL.
- ☐ The page is not accidentally set to noindex.
- ☐ robots.txt does not accidentally block the page.
- ☐ The page is accessible through internal links.
- ☐ Important links work correctly.
- ☐ Relevant images have appropriate alt text.
- ☐ Images and scripts are not unnecessarily slowing down the page.
- ☐ Schema.org data matches the actual content.
- ☐ Structured data does not contain invented information.
- ☐ Language versions are correctly connected.
- ☐ The sitemap contains the correct URLs.
- ☐ Deleted pages are handled correctly.
- ☐ Social metadata is configured.
- ☐ The content genuinely addresses the search intent.
22. SEO Is Not Just About Adding Keywords
This is one of the most important things to remember. Adding the same keyword twenty times to a page does not automatically make a website better optimized.
Effective SEO is about making a website understandable, accessible, technically sound and genuinely useful to visitors.
Title tags, H1 headings, canonical URLs, Schema.org and meta descriptions are all pieces of the puzzle. They do not replace useful content, a logical website structure, good internal linking or a solid user experience.
Conclusion: Fix the Foundations Before Pushing Further
When a website does not rank as expected, it can be tempting to immediately publish more articles or add more keywords. In many cases, however, it is smarter to check the foundations first.
A missing H1, duplicated titles, incorrect canonical tags, accidental noindex directives, an inconsistent sitemap or incorrectly implemented structured data can all create problems that are easy to overlook.
By working through these elements systematically, you create a much healthier foundation for improving content, search intent, keywords, internal linking and overall organic visibility.