Place food at several levels. Mourning doves, sparrows, towhees and juncos are ground feeders; cardinals, finches, and jays like table feeding while titmice, goldfinches and chickadees prefer hanging feeders. Feed woodpeckers, nuthatches and wrens on tree trunks.
Put out sunflower seed, white proso millet, thistle, suet, peanut butter and dried fruit to attract a variety of birds.
Don't forget fresh water.
Photo from Droll Yankees Bird Feeders