Feeding seed eaters is another matter. T he prime food is sunflower seeds. If you really want to play Santa Claus, crack the sunflower seeds. There's no easy way I know, but a rolling pin works. For coaxing birds to eat out of your hand, there's probably no better bait.
Flax seed attracts some birds.
Few seem to care about wheat or oats or barley. Corn, either whole, cracked or on the cob, is popular with Jays, Titmice, Cardinals and Red-bellied Woodpeckers. Milleted sorghums are fine and inexpensive. Birds much prefer white to red millet according to a wholesaler of bird seed. T here are dozens of other foods that birds like.