A broken link, also known as a dead link, is a link that no longer functions.
The best way to fix a broken link is to redirect it to another page. If you, for example, moved the contents of an article to a new location, you'll need to redirect it to the newer article.
To accomplish this, set up 301 redirects. The All in One SEO (AIODEO) WordPress plugin is the most straightforward way to fix broken links and set up redirection. It comes with a powerful redirection manager that lets you track 404 error pages and create 301 redirects.