It seems like this site is based around the following of various users. How would you find users you agree with, that have similar interests to you? On reddit, I'd just visit a subreddit, say, /r/MechanicalKeyboards. On Hubski, it seems like I'd have to hunt a bunch of mechboard enthusiasts down to get the latest news around the subject, and how? And about the hubwheel next to a link or comment. Clicking that shares it with my followers, from what I've gathered. But are there any unwritten rules or guidelines as to when you'd click it? If you agree with someone? If you think their post/comment contributes? If you find it extremely well made? If you just like it? If you feel like your followers would enjoy it? Do you do it often? Not very often? How often? Oh, and how would a comment shared by someone I follow show up in my front page? This seems like a very interesting site and I'd love it if people would educate me further on the matter.
My understanding is that content categorization here is based on tagging, so you would look for #mechanicalkeyboard, #mechkb, or #ripster. It's a little more free form, which makes it harder for a community to agree on a category name, but maybe there's tag suggestions - I don't know, haven't made a post yet. It is cool that the system apparently supports multiple tags on a post though, so you can effectively not have to worry about crossposts and split discussions. Made yourself an ergodox? Tag as #mechkb and #maker and both groups get to talk together.
I think with comments, clicking the wheel works identically to upvoting. With posts, it will be an upvote + share / broadcast to your followers. If you haven't already, the primer is worth a read.
I've only been here for a couple days, but this system seems like Tumblr: you press the wheel to share top level posts to those who follow you or to create a set of content you've seen that you care about. You press the wheel on comments to "like" them (I think).