By experience and perseverance. each time you try to invest in those coins you will land to some review sites sometimes in a group where they tackle the coins that might become successful in the next years from that huge number of coins but none of this option will really give you the right answer. You need to work on your own to see whether you decide to invest in it or not. It's better to have a local community where they will help you if you are just a starter and they won't gonna teach you to advance things just some basics to get you going on your first journey.