Turn a topic of genuine curiosity into a specific, researchable question that is neither yes/no nor too broad to answer in a paper.
A topic is not yet a question. "The Transcontinental Railroad" is a topic -- it does not point toward any particular answer. A strong research question narrows a topic to a specific angle, one open enough to require pulling together multiple sources, but focused enough to answer within one paper. It should never be answerable with a single yes, no, or fact.
Use the "so what" test: a good question leads to an answer that reveals something -- a cause, an effect, a pattern, a connection -- not just a list of facts. Get there with a narrowing funnel: start with a broad topic, pick one specific angle inside it, then sharpen that angle into an actual question.
Mastery looks like: They write a specific, open research question, not answerable yes/no or with a single fact, that requires synthesizing multiple sources.
Common stumbles: Choosing a question that is really a topic in disguise, or one answerable by a single fact or date.