The shorturl plugin offers a way to shorten the URI of your pages to a shorter version. This feature uses a base 36 number and the /s path. So the very first page will have path: /s/1.
The shorturl offers a signal so other plugins can prevent certain paths from being shorten. For example, paths under /admin do not need to be shorten since you will not share those paths.
At some point we will also offer inline support for third party shorteners. However, these have had bad rep and many have closed too. Unless your domain name is really long, there should be no need for such third party shorteners.