There is no such thing as path to guaranteed profit. You need to update yourself with what's going on with the particular project you are interested in. As they vary from one project to another, you need to keep up with what's happening to their developments and their plans. Some projects will abandon their platform without warning, so you need to be cautious on how you are allotting your budget to this type of volatile investment.
If someone is willing to take their chances with altcoins then they need to keep the budget allotted to them at a very low level.
Because most altcoins will show a performance that is nowhere near what people expect, and if you invest all your money in them, then your losses will be just as big, but if instead you only use a small amount of money, the rest of your money will be safe and you will discover that trading is not really for you.