Fediverse

I currently use mbin and I like it because I like reddit-style social media, but for stuff from specific people and organizations microblog is sometimes better. I want to use the microblog part more (for example, make a post asking the Vivaldi account if there is any possibility of Vivaldi switching to a Firefox base instead of chromium. also I know it's not that easy no need to discuss that on this thread) but tbh I don't understand microblog stuff at all. in particular I want to know how I'm supposed to use @s and #s, and how I'm meant to interact with it. I know this seems kind of silly but I've never really used microblog-style social media until I got into the fediverse a couple months ago.

edit: to clarify, I am not asking how to use the microblog feature of mbin. I am asking about microblog in general.