There are several ways. On steemit you write or post something interesting and get reward from your peers by upvoting. The traditional way is to buy crypto and hold it until you find something you like better. Traders typical has a span of minutes to hours, while investors sit on their holdings for months and years. You can buy mining contracts and make them mine for you and some coins even have interest payments like a bank account. Still confused? Read. There is a ton of information to digest. You have to lest to set up a wallet, probably more. You have to learn to exchange or use tools to convert. It's not that difficult after you find tools that work for you.