Felix Stahlberg, Commercial cityscape [Times Square], 2017 (Wikimedia Commons, CC 2.0)
Literature reviews are a particularly useful resource when doing research. They address the issues involved in a specific question and the debates among scholars. They map out the intellectual terrain succinctly and give you the major landmarks in terms of key authors and significant titles for greater understanding. It is one of the best places to find discussion of issues that are unresolved or in contention.