We've been told to buy when the price is low and sell when the price is high. This is pretty much the thumb rule in trading.
When Luna didn't do it's first x10 come back. I opened my wallet and was staring at Luna coin for some minutes. Without doing any analysis, a rule stroke in my mind. " When others are afraid, be greedy"
I wanted to be greedy with Luna but I gave up and because I am not a big fan of altcoins. In less than few hours Luna made huge come back and I respected the rule.
What I am implying is;
Buy when the price is low, always buy. Then remember the other big rule, don't invest what you cannot afford to lose.
Be sceptical about shit coins please.