Looking at a site's domain isn't enough to determine if the source is credible. When searching the free web, you'll typically encounter the same few website domains. Here's what they mean:
The domain tells you nothing about the information it contains, which is why you should evaluate everything carefully.
Try library resources first (like books and databases). If you search Google, try these search tips:
Use "quotation marks" for phrase searching (ie, "food recalls")
Search a specific domain: site:.gov (ie, food recalls site:.gov)
Use the SIFT Method to evaluate what you find