Read the whitepaper and if it makes no sense than it's likely a scam coin. They like to overgeneralize about changing the world, and use crypto terminology to the point where it makes no sense. You can buy a whitepaper on People Per Hour or Fiverr for $100, so it goes to show that most of them mean nothing. See if you recognize any of the team from other projects as the team is the most important.

Check to see if they are a working product. Stay away from anything promising the moon.