If you are looking for a place to begin your research, the library's Discovery system is a great place to start. The Discovery system searches all of the library's databases and the library catalog at the same time. The Discovery system searches for articles (journal, magazine, and newspaper), ebooks, print books, and more. It is the broadest possible net that you can cast to catch resources.
If you are looking to search a database specific to your course of study, you can browse the A-Z Database List or find a Subject Guide on your subject which will list databases useful for that kind of research.