Also be careful to not go overboard. The Freedom 5x bonus is limited to the first $1,500 in spend per bonus period, but resets each time the next categories come around.

Hopefully you also have the Sapphire Preferred to transfer your freedom points to for travel. If travel isn't your goal, then you might be better off with the AMEX Blue Cash Preferred which gives 6x cash back at grocery stores, and doesn't have the $1,500 limit.