But they're all different.
What's most different about square dance is
Here's a video illustrating what modern square dance looks like:
Note the rapidity of the calls. The dancers do not (necessarily) know what's coming next; they are following the calls, all that quickly.
https://www.youtube.com/watch?v=fcWMp1tcn18 is a video of some people dancing at a higher level of proficiency, with lots of "styling" -- I think this video is really neat. But the former video is more typical.
One thing I find interesting about the calls is that they are very dependent on exactly where you are AND which way you are facing. Which way you end up facing at the end of a particular call is part of the definition of that call, and since most calls are in terms of whom you are facing, if you face the wrong way you misinterpret the next call.
For my own study I've been making lists of figures, my short descriptions of them, and links to videos illustrating them. I have a list of Basic and Mainstream figures (Basic is the first level; Mainstream is the second level, and the one which you should generally achieve to be able to dance at least some of the time in most places you go), and I've done only partial work on my list of Plus figures (the level I've more recently completed learning). Altogether the levels are Basic, Mainstream, Plus, A1, A2, C1, C2, C3. 'A' for "advanced", 'C' for "challenge".
Square dance groups in the vicinity of Toronto are listed at
But as the above may imply, you generally have to join at the beginning of a session (e.g. September), so that you learn the calls along with everyone else and the group can progress through the season.