If you were trying to learn about the Boston Marathon Bombing, you could use different types of sources in different ways.
Photos from social media show the event in real-time
News posts show what was reported as the event was unfolding (which may later prove untrue)
News articles from days later show more as details emerge from officials
Months later and continuing today, scholars analyze aspects of the event related to their area of study, like how the media represented the suspects, how children were affected by the event, and how stock markets reacted in Scholarly Journal Articles.
After years, journalists and scholars write Books adding historical information and analysis to the event.
All of these sources are "about the Boston Marathon Bombing," but only some are useful to answer the question "why did the bombing occur?" Others might answer "how did law enforcement and first responders handle the emergency?" and others might answer "what was the impact on the city of Boston?"
Choosing a source is about more than just credibility, it's also about how well the source answers your questions or furthers your research.
2. ASK YOURSELF: What source types exist that are on the topic of your research question? What source types will help you answer it?
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