1) If you are just starting, open a free demo and practise
2) Be aware of events that might influence your technical analysis
3) If you want to day trade crypto, find a coin that best fits your trading style and find as much information about the coin as possible. If you focus on more cryptocurrencies, your focus splits. (This differs from long term investing where you should focus on portfolio diversification)
4) With a real account, trade only with money you can afford to lose
I day trade mainly mid-cap and high-cap cryptocurrencies, be certain that there is a lot of volatility so there is money to be made even there when day trading. I run a website about CFD day trading cryptocurrencies but unfortunately for some reason, I cannot post links here so in case you would want to point into a good direction, you can PM me.