Depending on the information you are looking for certain databases will be more useful than others.
Public Affairs Index, for example, contains public health journals; while APA PsycINFO contains psychology journals.
A multi-disciplinary database that includes both scholarly journals and popular sources (newspapers and magazines) with coverage for nearly all academic areas of study including social sciences, humanities, education, computer sciences, engineering, physics, chemistry, arts & literature, medical sciences, and ethnic studies.
A good resource for general research.
EBSCO Tutorial
Discovery allows you to search almost all our library databases from one place and provides easy access to our full-text articles, journal titles, e-books, print books, and DVDs. This is a great general database and is recommended for Writer as Advocate and Effective Writer.