1: Anyone asking you to invest and earn a huge profit is a suspect until proven to be a legit investment (stay away from Ponzi schemes and stay safe).
There are some times when you see some offers, then you should know you are likely going to be scammed if you fall for offers like that, but a lot of people are always looking for cheap things, so they will think it's an opportunity and they will want to utilize it. If you are asked to invest a huge amount of money and you are promised a high reward, and most of them always say there is no risk in the investment, and you will get a high reward within a short period of time, offers like that should be avoided. Any investment that claims there is no risk, then it's likely you are going to be scammed.
2: Anyone asking for your private information is a suspect; never give out your private information.
No matter how close you are to someone, when they start asking for your private information, you should start suspecting them. Nobody can be trusted, and someone you call your close friend might end up being the one hurting you. And when you visit any site and they are asking for your private information, if you can avoid giving out your information, then you should do that, and if you can't, then just stay away from the site.
3: Any site you are not familiar with is a suspect unless you are very sure it's the right website, so do not expose your information carelessly.
Be careful when visiting any website, make sure you double-check the website that you are visiting and make sure it's the real site that you intend to visit. If you are planning to download any application, then make sure you visit the official website of the application you are planning to download and get the link to the application from their official website. There are a lot of fake applications on the Play Store, so we have to be careful.
5: Any random person you meet online and he or she is telling you about investment is a suspect unless proven trustworthy.
Don't trust anyone you meet on the internet, no matter where you meet them, they should be treated like scammers. That's one of the ways to stay secure when you are on the internet. Some people will make you think they are real, but at the end, they are scammers, so don't trust anyone on the internet. So if you are asked to come and invest, then make sure you do your research to confirm if it's real or fake before investing in it. Don't be deceived by the testimonies they show you.