This video shows you how to check the credibility of a website. You can easily spot fake sites and avoid scammers, by using this trick. It also shows you if a website is selling fake products.
Link to the website: https://www.scamadviser.com/
*Note* the website can’t give 100% correct report every time. But it will at least give you a clue. Here you can read how they calculate the report for every sites: https://www.scamadviser.com/faq.