There are many Bible dictionaries and Bible Encyclopedias that can be helpful in studying the Bible.
Dr. John McClintock and Dr. James Strong (author of Strong’s Exhaustive Concordance) were editors for the Cyclopedia of Biblical, Theological and Ecclesiastical Literature, a massive but very impressive work.
Baker’s Encyclopedia of the Bible (a four volume set) is good.
The International Standard Bible Encyclopedia (4 volumes)
Illustrated Bible Dictionary (three volumes)
Holman’s Bible Dictionary
The New Unger’s Bible Handbook
The Baker Theological Dictionary of the Bible
Smith’s Bible Dictionary
Unger’s Bible Handbook
The Victor Handbook of Bible Knowledge
Easton’s Bible Dictionary
Hitchcock’s Bible Names Dictionary
Smith’s Bible Dictionary