I have virtually zero knowledge of The Odyssey as a Greek mythology, save for a few recognisable names like the Helen of Troy, the Trojan War etc. I do want to enjoy the movie to its fullest, and if learning about the plot material is essential to it, then so be it. Is there a good resource giving a summarized version of the plot enough to understand the film? If so, I would really appreciate it if you shared it here.
I think it might be fun if you do it the other way around. See the film first.
Then get ahold of Iliad and Odyssey and read them, trying to match stuff from the movie to the original