One sure way is to know if a project is scam is by checking out the developers linkedin profile that is if the project is not an anonymous one.... If you search and you don't see their linkedin or however u find it but it something related to the project is not found on the profile then it is definitely a scam
Yeah. And it's also important to be able to contact a team
Most important is read the whitepaper, the team behind the project, the partnership, Roadmap and the platforms.
There's a project that are scam but it's easy to know if it's reliable and credible.
In the world of the crypto currency, you may encounter many of the projects which seem you to be the best project for the sake of investing of your money but later on, you get to know that the project is scam and that you have lost all of your money too. You need to think well and study well about that project and then invest only when you are dead sure that you are going to make good money out of it.