The OBSD docs are good... if you know what you're looking for and are familiar with UNIX already. For a beginner, they are cumbersome, hidden, and annoying to parse.
Good docs look like Tailscale[0] and that similar style where it has the Getting Started at the beginning, along with a nice menu tree on the side that gives an overview and provides easy navigation. You shouldn't need to know what you are looking for when you are learning a platform.