Is it possible to make good money on online trading?

Yes, you can make pretty good money, but you can lose just as much: if you choose the wrong assets, you will lose all your money. As a result, if you are new to trading cryptocurrencies, try to build a conservative portfolio of cryptocurrencies and choose reputable brokerage firms such as paxful vs bybit, which you can read about here https://tradersunion.com/brokers/crypto/view/bybit/bybit-vs-paxful/