firstly, Learn the chart, learn Tech analysis, fundamental analysis and sentiment analysis. You can start by learning first how volatile crypto then learn all the trading signals so you can read and understand chart and learn how crypto move and what makes it go up and down. For beginner, it's ideal to start small while you're learning then invest little by little as you learn.
Very good advice. Learning and starting small. Actually people can start trading with demo accounts. I think there are sites having it. Before I too opened an account on HitBTC because they have demo account. I am not sure if it still exists but I think so.