Here's a website that could prove useful. It's called "Shmoop," and is self described as "an educational website for high school and college students that covers literature, US history, and poetry." The creators continue with, "Don't let our playful name throw you off; our content is painstakingly researched and our writers are primarily Ph.D. and Masters students from Stanford and Berkeley. Unlike many notes/cheating sites, we work closely with teachers to make Shmoop a valuable resource both outside and inside the classroom." The site is free and requires no login, so check it out at
http://www.shmoop.com/ and take the "Tour de Shmoop."