compare and contrast two pieces a specific aspect of them like a theme, symbol or so on.
Hey, you got great advice from Pilar. Welcome, Newwriter!!!
I want to mention that I would use this same strategy... Google the title of a poem and the word "analysis" so that you'll find a whole lot of discussions. You could use the word "theme" instead if you want to.
Google around til you find a great, interesting analysis of a poem. Then, write a few notes about themes and symbols. After that, search for another analysis, and look for that common thread!
Remember to show both similarities and differences.