In order to engage in day trading you need to have experience and knowledge, for this you need to try your hand at trading on a demo account in order to gain experience. If you do not know where to start, find a trading pair with a fairly high trading volume, for example ETH/BTC and watch the price change, if you see an opportunity to earn, then go to a demo account and try to trade, and if not, then choose another trading pair and do so until you find something that can bring you profit.