1.Only invest what you can afford to lose.
2.Never invest in something you dont understand.
You wont immediately understand everything, thats ok. Do some research.
3.Dont day trade unless you spend a minimum of 6 hours a day on the markets.
4. Be patient and buy it on sale.
I think to do day trading do not need to spend so much time. I know guys who are quite enough 1-2 hours a day to get their 3-5%. But for beginners of course it will take more time