You will get similar advice's from different people  about the basic principles of trading like buy when low then sell when high, So ill going to be more specific, First thing to do is try to look for different types of coin and choose what coin will be fit for your capital and that's alt coins because its cheaper. Second thing is try to search about the coin your'e going to invest if it has potential, It means that you need a good analysis about the specific coin before investing. Lastly just try to work on signature campaigns while waiting for your coins to increase its value in the market.