For fast choose of the coin, I think it's enough if we can check on the marketcap how the coin movements and if there is a good moving from the coin and we can know that this is the time to increase, then we can try to buy the coin, decide in how much price we can sell to make a profit. And if the movements still on the good progress then we can continue to trade and we can expect for a big profit by doing this over and over. One of my friends always makes scalping trade especially if he saw the coin has massive moves in the market because he knows how much profit he needs to get in a one-time trade. And if he can do this over and over, then it means, in that day, he can get a nice profit, and it means he can make money.