That's how crypto market works. Though nothing is guaranteed here. You can choose a coin to trade by observing the recent volume change and price movement, but the trend may end soon. And you will be trapped. Newbies become a victim of these. So it's better to choose top altcoins of crypto market for trading. Cause low marketcap coin shows good movement mostly but there is a high chance that it will get dump shortly. A trader will be able to make great amount of profit if he can follow this method with top marketcap coins.