The most common problems encountered by web crawlers

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14. Nofollow Attributes in Outgoing Internal Links

Internal links containing the nofollow attribute block link juice from passing through your site.

For more information, read the post: What is Link Juice and How to Optimize It for SEO .

15. Incorrect pages found in sitemap.xml

Your sitemap.xml should not contain broken pages. Check for redirect what is 99 acres? chains and non-canonical pages and make sure they return a 200 status code.

16. Sitemap.xml not found

Lack of sitemaps makes it more difficult for search engines to explore, crawl, and index your site's pages.

17. Sitemap.xml not specified in robots.txt

Without a link to your sitemap.xml in your robots.txt file, search engines won't be able to fully understand the structure of your site.

Other common errors related to crawlability include:
Pages not crawled

Internal images broken

Broken internal links

URL with underscore

4xx errors

Resources formatted as page links

External resources blocked in robots.txt

Nofollow Attributes in Outgoing External Links

Crawling blocked

Pages with only one internal link

Orphaned Pages in Sitemap

Pages with a scan depth of more than 3 clicks

Temporary redirects.