Just like every investment, what we need is prior and existing knowledge. We must research what kind of investment we are to be into. Be skeptical and always consider factors in picking the best alternative coin. Choose wisely. One of the factors are community number in quality not in number because nowadays lot of members in a community but has weak hands for such. They dont want to lose some or earn just a little so they dump it all the way, developers and team who are very active and always do updates to its community and is making their hard work for the success of project. Also try to check tge project they have and ask these questions:
Is it realizable?
Can be achieve? But when?