Seeds, like sunflower hearts and various seed mixes will attract a number of species into your garden. Sultanas (first soaked in water) will attract ground feeding birds such as Blackbirds. Some kitchen scraps can be fed to birds, such as bread, cheese or apple, however salty food scraps should be avoided. Fat smeared into tree cracks will encourage Treecreepers, Nuthatches and Woodpeakers and live foods such as mealworms and waxworms will encourage Robins, Tits and even Wrens.
For more information on feeding birds in your garden please visit, the RSPB or the BTO's website.