It's hard to predict which out of thousands of alts will go up, but what you can predict is that once a coin went up, it's bound to go down. Like, take the best performing coin right now, Dogecoin, there's absolutely no justification for its price, it has no adoption or promising features, it's pure hype. It's bound to go down, so if you carefully short it with small leverage, you're going to make profit. Obviously, the danger is in the known trading wisdom - "the market can stay irrational longer than you can remain solvent", but still the fact that pumped coins will go down is something that you can rely on.
Like Doge's astonishing rise. It must come down after the rise. While it's true that it's going to go down, investors will just see it as an opportunity though. Hard to say if they are a newbie or not but seeing how much marketing had been established for this doge. An investor will often see the two sides, could this joke end, or could the could really stand out?
Altcoins are risky so its hard to know which coin will have its time to the moon and can you get some on time.