First things first: Make sure your instructor allows web resources as references before you use them. Some will only allow references from scholarly journals and books.
On second thought: If you are permitted to use web resources in your papers and projects, you will still want to evaluate the information to make sure that it is an authoritative and credible source.
Some things to consider in evaluating all types of sources*:
Currency: Is the website current and up-to-date?
Relevance: Does the information have anything to do with your topic?
Authority: Is it authoritative?
Accuracy: Is reliable and true?
Purpose: Why does the information exist?
Check the acronym. Did your website pass the CRAAP Test?!
*Criteria adapted from the CRAAP Test, Meriam Library, California State University, Chico