Now you know what it is, but you need to know that day trading is not easy for most of the people. I advise you first to get into the usual trading or long term trading as we call it, just to feel the whole thing. After you get some experience you could do this one too if you like it.
Yes, this point is very important for a newbie. Because day trading is almost like a gambling just a guessing game and in this guessing game many times we will do a mistake and even experts can't predict things every time correct. So if your a new to trading then first start with investing and slowly learn how this trading works then can try your luck in day trading.