Reference books -- dictionaries, handbooks, encyclopedias -- are good starting places for basic information. Find them on the first floor of the library, between the front desk and the Write Spot.
Books on your topic go into more detail and provide a lot of background information. Once you have a clear idea of what you are looking for, check the library catalog.
Articles are really good if you have a focused question.
Find articles in the library databases. You can search them all from one box, but that's like drinking from a fire hose. Pick the best database for the job, and your life will be easier.