There are many different types of sources available in this database (see screenshot below). While some are easy to understand, others benefit from a description:
Viewpoints - these are typically pro/con articles, the article title should help define what side of the issue the article supports
Reference - typically means that you will get a good, general overview article on the topic
Related Topics - this is the database trying to help provide you with ideas on what other sources may be relevant to your research
Academic Journals - this is typical high-level, complex research studies. It can be helpful but normally you do not need to research at this depth.