Bible introductions (also called surveys) give you chapters on each book of the New and Old Testaments, which give you a lot of information such as literary genre, important themes, when the book was written, who wrote it, etc.
The resources in this list are types of Bible dictionaries that cover all of Scripture. Look up people, places, themes, etc that you would find in your passage.
The dictionaries in this list are types of Bible dictionaries that focus on particular sections of Scripture. Look up people, places, themes, etc that you would find in the particular parts of the Bible. There are some background commentaries listed, too - look up a particular Bible passage, and discover context-specific information that will help you understand the passage.