CMC only gives a rough idea on how it is currently performing. You can see price history, the volume & supply and the places where you can buy into the project (well, simply buy tokens that is).
Next to this you need information about team, roadmap, feasibility, product, long term prospect, advisors, whitepaper etcetc....
And even then it may not be that easy to assume the token will make you a lot of money, as even the best of the best projects out there currently have difficulties even reaching half their former ath
. Welcome to the not so great current crypto times
.