There is not a manual for this, or we would have a lot of rich bots, or maybe there exist some but for the majority of traders it's a real matter of luck (and little skill too). You have to do your own researches and idenfity undervalued projects with a lot of potenitality. Don't let your emotions bias your judgement, it's not very easy to distinguish between a valid project in the substance and one presented well at the surfice but lacking of real development, so you have to pay attention to details, GitHub in primis of course (quantity and quality of commitments) and maybe 'trusted' developers or advisors or auditing procedures, in secundis. When you have identified something you put some money in it and wait, sooner or later the market will find that little gem too and it will moon.