The Old Testament of the Bible is the first half of the Christian Bible, sharing stories with the Jewish torah. The Old Testament tells the story of God's creation of all existence and His evolving relationship with mankind, from His expulsion of Adam and Eve from the Garden of Eden for disobeying Him, through the flood and preservation of Noah, the covenant between God and the Israelites, and the descendants of Jacob, their battles, misfortunes and victories. Thematically, the Old Testament emphasizes obedience, law, tradition, honesty and piety.
Their book summaries aren't as good as other providers, but PinkMonkey often has interesting insights that aren't mentioned elsewhere on the Internet. For example, they go over literary elements (like setting, conflict, and mood), compare and contrast, and symbolism/motifs. It's a good site if you want to find a unique fact or angle that other students don't know about.