Some of the strategies that I used were to look at a couple of stocks and then decide which one is doing the best right now and which one I think will do the best in the long run. Another strategy I used was to save some money so if needed you can sell a stock your doing bad with or you want to buy a lot of stocks from a company. I think that these strategies will work will work if your smart with your money and if you can assess well.
Some strategies I used for buying and selling the first thing I did for buying stocks was to find a company that is doing well and invest around 20 shares from them then I would see how they were doing over a period of time if the company is doing good then I would keep the stock and if the company was doing bad I'd give them a couple of days and if they're still doing bad I would sell them and take the penalty.