While the library pays for many scholarly peer-reviewed article databases, there are also other free databases on the open web that can help you find quality scientific articles. If you find a citation for an article without the full text, you can request it for free through Interlibrary Loan. If you ever have a question about evaluating sources, determining what type of source you're looking at, or locating the full text of an article, contact me for more help.
Because so much information is now available online, websites are a huge category. Be sure you are using quality websites and thoroughly evaluating your information.