SEO Errors

404 - Responds with an error, but shows a custom page to help your visitors.
200 - If a page is missing, it's replaced with the custom error page.
302 - If the page is missing, it's replaced with a temporary redirect to a custom error page.
301 - Redirects errors to either a custom error page, or some other page in the site.

Thanks neha nice information sharing...
 
1. Duplicate versions of the home page
2. Un-optimized title tags
3. Duplicate title tags
4. Duplicate content
5. 404 errors
6. No deep links from the home page
7. Too many links from your home page
8. Un-crawlable site
9. Unreasonable SEO expectations
10. Hiring a crappy SEO
 
Use 301 redirects rather than 302 redirects when redirecting URLs on a site to ensure that link juice (ranking power) is passed between the redirecting web pages.
Web pages that return 404 (File Not Found) for extended periods of time and that have valuable links should be 301 redirected to other web pages.
It is important to have customized 404 pages with recommended navigational options when website visitors request pages that return a 404 response code.
 
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