Because a large number of such advertisements are currently rampant, many people have been deceived, and the swindlers are rampant, so I urgently wrote an article to inform everyone of the 4 anti-fraud principles: 1. Do not join if they ask you to pay first, 99 percent of them are cheats; 2. Do not send text messages to a certain number first (usually the verification process of formal websites is: the website sends you a verification code first, and then you enter the verification code on the website); 3. Be careful of any website without a formal filing number; 4. Be careful of Trojan horses if you need to download unknown software when joining.