With the popularity and development of the Internet, online fraud had become an increasingly common form of crime. There are many ways to scam people online. Some fraudsters even use virtual identities to scam the victims, causing huge property losses. Therefore, we must learn to guard against online fraud and protect our property. In the online world, we often come into contact with various websites and applications. But not all of these websites and applications are necessarily secure. Some websites and applications may contain viruses, trojans, or other malicious software that can steal our personal information and even infect our computers. There are also some scammers who use fake websites or emails to trick us into doing something to cheat us of our money. We must learn to identify fake websites and emails. To do this, we can use anti-virus software, anti-virus software, or other security tools to detect malicious software on the computer. In addition, we can also set a password in the browser and avoid using public Wi-Fi on the public network. We have to learn to protect our personal information. On the Internet, our personal information is easily attacked. Therefore, we should try our best to avoid revealing personal information such as social media accounts, bank accounts, etc. on public networks. In addition, we should change our passwords regularly and make sure they are complex enough to prevent hackers from cracking them and obtaining our personal information. We must learn to avoid believing false news. In online scams, scammers usually trick us into believing false news in some way. Therefore, we should be vigilant and not trust information from strangers, especially those that don't seem to be true. To prevent online fraud, we need to be vigilant and raise our security awareness at all times. We should learn to identify fake websites and emails, protect our personal information, and avoid gullibility. Only in this way can we effectively guard against online fraud and protect our property.