"Strategy" in a game in which numbers are drawn randomly?
Strangely, there is strategy. You can't improve your odds at all (1, 2, 3, 4, 5, 6 is just as likely as any other result) BUT there are certain numbers that people play more - ones that make patterns on the tickets or birthdates etc... which mean that if you did happen to win with those numbers you'll be splitting the money with more winners.
So, the strategy of picking numbers that other people are less likely to pick because of these reasons means that if you do happen to win (no more or less chance) you'll at least have increased the chances of having a larger share of the pot.
You you pick 1 - 6 and won the jackpot you'd likely be sharing it with several thousand other people (yes, that stat surprised me too).