It is very important to check if links on your domain are linking correctly and therefor it is recommended to check them on a regular basis.
The Website Success Dashboard offers a quick overview to identify if links are broken. If you would like to figure out which link is broken go to "Website Success " -> "Indexability" -> "Outgoing content" and click on "Add Filter" select the filter "Crawl Inventory(Group)" and set it to "broken external link".
Now you can see all broken links we have found on your domain, that are pointing to external domains.
Ideally, all links will point to a page with a status code 200.