It's not easy. You need to did various research started from analizing the team, roadmap, hype, code, and many more. These things can be done when you can spend a lot of time to dig the project.

Try to dig it and do your own research. If the team was not revealing their identity and it has more than 80% chance to be another scam project and this must become the main concern to analyze or discover the scam project and avoid to invest on it.

I have shared that but you must focus on the team. If you are not so pro in programming language and then you can ask someone who expert on this to audit the code.