For example, I saw this question, and I have the same question. I would like some way, within the system/site, to monitor this question if it receives an answer. I don't want to post a comment on it because I don't have anything additional/useful to add to it, but it seems that would be the only way to mark it to refer to later (through Activity). I am new to the stackexchange sites, so I'm not sure if there's some other commonly used method I just don't know about. If there's not, even something like the equivalent of Wikipedia's Watch option would be nice, or some other way to bookmark/favorite a question (which I imagine could be handy for Guide questions) so you can easily refer to it.
I realize I could just bookmark the specific page for the question, but as stated, I'd prefer an in-system way of monitoring stuff before cluttering up my bookmarks.