Gale In Contex: High School is a good entry point for research that focuses on articles and resources that are at the high-school level of understanding. You won't find really complicated scientific papers here, but you will see a mix of resources from magazines, newspapers, articles, and online resources.

Best for: general research on a topic of interest!

Gale In Context: Opposing Viewpoints is great place to gather research on debatable issues in the world, with an emphasis on how these issues are viewed from a domestic (United States) point-of-view. It presents these topics from multiple sides by providing articles and sources that give you a better idea of all the ideas, information and supporting arguments.

Best for: gathering resources for an argument paper or debate.

Gale in Context: Global Issues provides a nice complement to Opposing Viewpoints.  It allows you to search for important issues in today's world, but it emphasizes a more international point-of-view with topics and resources that come from around the world.

Best for: argument essays, debates, research on more international issues.