An overview of your broad topic area helps you start to get informed on your topic by providing factual content from a non-judgmental standpoint.
You can learn the following from reference articles (see the example on this page from an article on genetically modified foods):
Sample search in Gale eBooks of the starting idea, "genetically modified foods"
In the excerpt below taken from an article on genetically modified foods from the 2019 Encyclopedia of Technical Innovation in American History, we learn about issues, debates, history, stakeholders (individuals and organizations involved in the issue), and terminology.
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And at the end of the article, the Further Reading list provides other leads to research options.