I started with fx than moved to crypto. All on more enthusiastic level, nothing to serious, some sort of hobby. First you need to have basic knowledge about market, trends, graphs.., than just practice, read books, online tutorials etc.. With proper(more) knowledge you'll have some advantage over just simple guessing up or down. But even with that nothing is 100% proof. And i believe what's most important, is that you can handle your emotions. Don't rush, don't panic and accept losses (you'll loose at certain trades for sure), but it's ok, just forget and move on, you'll loose 20% at one trade, but you'll get 40% on another.