There are no good tips for buying a winning ticket, the chances of picking a winning set of numbers is 1 in 176 million no matter what your strategy. However there are certain sets of numbers that if they ever do come up will dilute your winnings manyfold.
For example, hundreds of people pick numbers in multiples of seven such as 7, 14, 21, 28, 35, and 42. Then hundreds more pick the consecutive numbers 1, 2, 3, 4, 5, and 6 or geometric progressions such as 1, 2, 4, 8, 16 and 32. Even more pick their birthday or anniversary.
Georgia Lottery officials say the jackpot reached $500 million, so if a winner emerges this Friday and 7, 14, 21, 28, 35, and 42 actually comes out, it's possible that 500 people also picked that combination so each "winner" would receive one million dollars before taxes. Not a good payout for something that has only 1 chance in 176 million of winning.
A quick pick is less likely to be a shared winning number.
I know what you're thinking, a million dollars is a fantastic win. However I believe nothing could be more disheartening than seeing you have a winning ticket and thinking you've won $500 million dollars (or $359 million in the cash option) and then find out that it only comes out to less than a million dollars.