One of the criteria you can use to evaluate sources is to check the domain and author of the website. The domain is the part of the URL that indicates the type of organization or entity that owns the website. For example, .edu means an educational institution, .gov means a government agency, .org means a non-profit organization, and .com means a commercial business. Generally, domains like .edu and .gov are more reliable and valid than domains like .com and .org, because they have more rigorous standards and regulations. However, you still need to check the author of the website, who is the person or group that created the content. You want to look for authors who have credentials, expertise, or experience in the topic you are researching. You can usually find the author's name, affiliation, and contact information on the website.