YOu just need to buy an altcoins with a very low price then sell it on a right tiome or high price .. If the price goes down buy an altcoin again to have a profit the wait .
to me by taking right decision in a right time is a tood of successful trading, you must study about the project or field where you are going to invest your money, you must also be very patient and broad minded and having decision power hope the suggestion will help you in successful trading.
Having knowledge to a coin and a proper research and good decision making which makes you profitable is considered as a good and succesful trade but still you would eventually do experience losses and thats normal because we really cant perfect our trades anytime since price is moving in any direction without knowing.