Sign up with an exchange. Fund your account. Watch the price of whatever coin you want.  When you think it’s low. Buy in. When it goes up sell. When it goes down buy. Repeat. Nobody can really tell you how to trade. You have to just start and form your own strategy. What works for one person doesn’t work for another. You have to figure out what works best for you. It takes time. Start small so you don’t have big losses.