How to redirect broken links to generic page on WordPress

I have an old blog with a lot of posts and links to places that don’t exist anymore, which creates a 404 error. I have been using the Broken Link Checker plugin to help me find these broken links.

Broken links are bad for SEO and you might inadvertently be linking to bad neighbourhoods if those old sites have been bought and redirected.

Bro­ken Link Checker keeps a run­ning list of all
the bro­ken links found in your posts, pages, blogroll, com­ments, and
cus­tom fields. It also allows you to eas­ily man­age those links from
one screen within the Word­Press admin.

The plu­gin has many more features:

• Mon­i­tor links in your posts, pages, the blogroll, and cus­tom fields
• Detects links that don’t work and miss­ing images
• Dash­board updates for bro­ken links
• Redi­rected link detection
• Changes appear­ance of bro­ken links in posts; the default is to set the text dec­o­ra­tion to strike through
• New or edit­ted posts are checked immediately
• Man­aged through the Word­Press Admin under the Tools -> Bro­ken Links
• Links can be removed or changed through the plugin’s page, with­out man­u­ally edit­ing each post

In order to fix these broken links, you can go into each individual post and replace the broken links with new urls that work. Alternatively, you can use the redirection plugin.

You can find out where your broken links are from your Google Webmasters account too.