I would looking into staking stablecoins as a starting point. Stablecoins are assets that are typically pegged to some other currency or commodity. For example USDC is a token which matches the US dollar 1:1. There are many reliable places in the crypto space which pay a high APY, much better than leaving that money in a bank account in my opinion.
So you mean to buy the stable coin like USDT or USDC and fix them on the exchanges to get the interest on them. This could be a good thing if you have a lot of money and you have no further knowledge about crypto currencies. In the meanwhile i suggest you to learn the crypto trading as this can give you much better results than only trading or staking the coins.
You need to have capital in order for you to stat the trading business. Many people do not posses much capital an for them, the best course of action is to earn some free crypto through Airdrops and bounty.
Also this may not make you much money, but for those who do not want to invest initially, this is a good way to start on crypto. It will also help you earn and as well as you will learn too.