Actually, everything seems to be very simple: just invest in altcoins when their price is very low, and sell them when they cost a lot. But it depends.
Everybody repeats this here. When low - when high... BUT, when is the LOW? That's the question.
What if you think it is LOW and you buy, but it continues to go down?
So here you want to know when to BUY, that is the question and NO this is not the answer you and other parrots repeating all the time.