Invest in what you know.
Time is on your side when you own shares of superior companies.
When stocks are attractive, you buy them. Sure, they can go lower. I've bought stocks at $12 that went to $2, but then they later went to $30. You just don't know when you can find the bottom.
Know what you own, and know why you own it.
You shouldn't just pick a stock - you should do your homework.
I've always been a great lover of baseball.