I started during intraday (also first time investing in the stock market) on last Friday. I invested in the stock which was already falling for a month. I thought it would recover at the end of the day but it didn't. I ended up losing $10. I bought it at the higher price and sold at the lower price. But you can also sell first and buy later. If I did it then I might have ended up in profit.
Now I've changed my strategy. Now I buy the rising stocks in regular option (not in intraday option). Now, I sell it in the intraday, only if the stock price goes higher.
I buy the stocks of companies who do business in the U.S.A and Europe. The U.S economy is growing over 4% and so I guess they would too.