Strategy#1- Its not what you buy, But also when you buy
Strategy #2- Buy for the long Term..There is huge difference between Investing & Trading
Strategy #3- Invest in small lots..dont invest all you investible money in one go
Strategy #4-Invest in Dividend paying stocks, this strategy is not suitable for everyone, but for those who need some kind of income coming regularly
Strategy #5- As with Buying , dont sell in one go..sell in lots

Bonus Strategy#Diversify- Never invest in just one or few handful of stocks..Diversify across industries and across different companies

Happy Investing!