I am a seminary student and I wanted some advice on which commentaries to buy and why. I was instructed by one of my professors to buy one at a time trying to buy the best ones. What I would like to do is add to my library slowly in this way, however I have run into a problem. How do you really know which ones are good scholarly works? Experience? Additionally, can anybody suggest some good resources for background/historical studies? I am particularly interested in the first several books of the bible esp. Joshua as I am writing a sermon brief on it later this semester. I appreciate all the help I can get, thank you.