For quick tips to help help judge the trustworthiness of all sources, check out this video from NCSU Libraries.
There is a lot of information out there. How do you decide whether it's good information? Try using the criteria in the CRAAP Test, (created by Sarah Blakeslee of the University of California at Chico's Meriam Library) to evaluate the sources you're considering. CRAPP stands for:
Currency - The timeliness of the information. Relevance - The importance of the information for your needs. Authority - The source of the information. Accuracy - The reliability truthfulness and correctness of the content. Purpose - The reason the information exists.