Trading in crypto is too risky than other market like stocks and forex, trading in crypto requires more and more of time and research effort since we can trade anytime it is prone to high change in dump and pump. We might miss some chances if we don't look at the graph or visit our exchanges even in one day.
Not only stocks, everywhere it is impossible for us to predict them in the market. Some times it is impossible for us to sell them because the price of a coin may increase even higher value and sometimes we might miss the boat like what was happened in 2017. So it is always good to set your goals before purchasing and selling your coins.