Using absolute links is the complete opposite of what you should do. If the page you are linking to lives in the same path, there is no reason not to link to it relatively. It makes the path structure more modular.
"there is no reason not to link to it relatively." You have clearly been so isolated in your thinking, you are incorrect. Again, it is their link to share.
And when they get more experienced, they'll probably want to migrate that site to a new host (for example my site was bbkane.github.io before I moved it to bbkane.com), which will break absolute links to the first (now down) domain. Yes, best practice is to set up a redirect from old to new anyway, but that's the kind of thing someone doing this for the first time doesn't think about.
So there's definitely a case for beginners using relative links. And it's less repetitive to type!