How do I fix the "Via This Intermediate Link" in Google Webmaster Tools?

Fix the 'Via This Intermediate Link' in Google Webmaster Tools:

• It basically means that when there is a redirect, Google will display you where the link came from.
• A 302 Redirect informs search engines that your page has only been relocated temporarily. This is bad since a 302 notifies search engines that the old URL should be kept because it will be available again shortly.
• As a result, search engines do not scan the new pages, and if they do, they will have a low ranking.
• Most significantly, links pointing to old content will not pass link juice to the new domain, resulting in a significant loss in search visibility and traffic.

Read more: I'm receiving crawl errors that are showing a missing category. How do I fix this?