A dead link (also called a broken link or dangling link) is a link on the World Wide Web that points to a web page or server that is permanently unavailable. The most common result of a dead link is a 404 error, which indicates that the web server responded, but the specific page could not be found. (Wikipedia)
As it is not easy to find each & every broken link on your blog, so you can rather use this simple tool which can easily scan your blog for broken link.
Here is the tool for you : Broken-Link-Checker
After checking your blog for the invalid links, simply either edit or remove them.
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