Heads up, Lemmy's block system is more like muting. I wouldn't really recommend it's use non-discriminately. This is because blocking simply hides users it doesn't prevent interaction on posts or comments, it doesn't deal with them if they are actually problematic users.
So if you see people being trolls, harassing others, or making bad faith arguments I highly recommend reporting them, as it can be helpful to alert admins and moderators of bad people and take care of them.
I see, so if I don't want to see a users posts and I block them, I won't see them, but everyone else will? I mean in a thread we are both contributing to?
That seems to be the case for me. My app (connect) won't let me interact with those users but IIRC on web I can (don't take my word though its been a while.)
Yup it has no affect on whether other people can see them, and no bearing on their ability to reply. Which is mildly concerning when it comes to harassment and blocking as a defense for harassment.