Avoid investing money on projects where their main point and focus is on the profits you will make, they promise fake guarantee also a a safeguard method that will make you very rich..this is a big red flag
If all the team talks about is money that you will earn without any explanation how they will make that happen and also no technical professionals behind it it's a big red flag.
I would like to add high profits. As most of the sto's do provide a fixed percentage of profit but they are generally on the believable side. There are also many dapps pools and farms that provides a fix percentage of reward, most of the time when it's a inflationary coin, the practice yield would be smaller.
Anything above 0.05% a day or 1.5% per month or 45% above could be considered a plain ponzi specially when they have no valid business to prove and all they offer is just a website.