Invest in a crypto market situation accordingly. There should be a framework for him to invest in which time to invest. And at what time to sell.
the most important things is we must know when to enter the market and when to exit the market my friend
wich mean don't be greedy and always set a profit taking target and stop loss if the market going to wrong directions
to know about that, we should learn about technical analysis my friend,,
so, people who want to start trading on crypto should learn about technical analysis first