For me, OpenBSD is a great platform to learn how computers work, even if it's a radically different OS compared to a GNU/Linux distribution or Windows.
When I started to use OpenBSD on an old Dell Optiplex G260, one thing that impressed me first was the quality of the man pages and the documentation. This might just be a small detail at first, but if you think about it, it means that you can find lots of information and some configuration examples without connecting to the Internet.
In an era where everything goes into the "Cloud", it is always good to have a solid base near you, waiting to answer your questions and ready to help you.In my opinion, every good project should have a good documentation, like OpenBSD.
Vincent Finance