Redirect links should be used in the following situations:
When changing the URL of a webpage: If a website changes the URL of a webpage, a redirect link should be used to ensure that users are directed to the correct page, and to prevent broken links.
When consolidating pages: If a website has multiple pages with similar content, it may be beneficial to consolidate them into a single page. In this case, redirect links should be used to redirect users who visit the old pages to the new consolidated page.
When a page is permanently deleted: If a webpage is deleted and cannot be replaced with a new one, a redirect link can be used to direct users to a similar page or a relevant section of the website.
When moving to a new domain: If a website moves to a new domain, redirect links should be used to redirect users who visit the old domain to the new domain.
In general, redirect links should be used whenever there is a change to a website that could cause confusion for users or lead to broken links. By using redirect links, website owners can ensure that users are directed to the correct pages and that the website maintains its search engine rankings.