The first step is to visit its official website. Scam usually has badly-constructed website or even doesn't have a one. Visit the website and download its whitepaper. By reading its whitepaper, you can better understand the project. You need to carefully examine its tokenomy, team, technology and roadmap. check if its tokenomy is sustainable, if it provides the information of team members in details, what kind of technology it uses and is it possible to adopt and whether they follow their roadmap. Scammers usually could not provide a sustainable tokenomy. If the coin is difficult to circulate, how will it appreciate? I will add something when I think of something new.