Rather than in the choice of code. Tools such as Google Search Console can provide a list of incorrect URLs for a site. Knowing that Google only displays 1,000 URLs at a time, if the tool reports, for example, 3,000 errors, it will first be necessary to correct the first 1,000 to have access to the following ones. These errors will have to be dealt with quickly because, on the one hand, the experience of visitors to the site will be improved and, on the other hand, the webmaster will be able to recover backlinks and thus increase the popularity of the site with regard to Google.
Indeed, if the tool encounters an incorrect URL, it means that a link, external or internal, points to this page. This information is also provided by Google Search Console. Regarding fax list internal links, it will suffice to correct the links. External links, meanwhile, will only have to be definitively redirected, using the 301 code, to pages related to their respective content on the site. In this way, the relevance will be much better and the popularity and trust rate will be increased. One of the most difficult tasks for an SEO agency being that of gaining backlinks, it is strongly recommended to carry out these operations.
The correction is quite easy but often takes a long time. All you have to do is redirect these non-existent URLs to new pages, or else, thanks to the 410, declare the permanent deletion of these pages. To redirect 404 errors, it will be necessary to indicate a new URL and choose a page of similar content. If the deleted page has no correspondence on the site, 3 solutions are possible: Redirect to a similar page Redirect to a page that is unrelated and unimportant for SEOSince July 24, 2018, Google Adwords no longer exists.