Usually factual questions are great places to start -- but not to end -- your research. Answers to these will generally be a few sentences. Sources will likewise generally agree.
What are the causes?
What are the consequences of this?
How does this information help us understand our world today?
Conceptual questions are the heart of your research. Answers will be much longer, with many sentences. When sources disagree, examine the evidence each is marshaling and rejoice!