The Mirror of Galadriel is so BIZARRE to me...

I have to say, for maybe the first time in this entire series I am confused. I just don’t know what really happened at the Mirror of Galadriel. Maybe I’m over-analyising it and it’s really much simpler than I’m making it out to be, or maybe it’s way more complicated and I need to have a better understanding of language in order to do it. But there are just some weird things that happened that I didn’t have the answers for.