Mine is simple and the best. Buy low, wait, sell high. 
For extra I do day trading when there is panic making the price swing up and down.
Don't force yourself to trade that much, take some distance from time to time.
I always follow the rule given by warren Buffet that"Buy when every one sells in panic and sell when every one starts buying".I have used this strategy and have gained more profits.Also follow the rule,"Don't put all the eggs in one basket" to avoid losses.For extra I do day trading when there is panic making the price swing up and down.
Don't force yourself to trade that much, take some distance from time to time.