If you want a good grade, use high quality, credible, and authoritative sources. The sources you select for your works cited or reference page is a direct reflection of the quality of your paper. You cannot expect to get a good grade if you use Wikipedia, random websites, and opinion blogs. The World Wide Web can be a great place to accomplish research on many topics. But putting documents or pages on the web is easy, cheap or free, unregulated, and unmonitored. You need to evaluate the sources you use. Think of it this way, if you wanted to decide which Smartphone to purchase, would you use a random blog, the manufacturer's website, or Consumer Reports?
When making a decision that will cost you money, you would probably use Consumer Reports to get the best information to back up your decision. When writing a research paper you want to use the best sources because using anything less could cost you your grade!
When you encounter any kind of source, consider:
Good research habits include identifying sources, assessing their expertise and verifying information found. So how do you decide if the information is true? This site from Justia Virtual Chase will help.