So it stands to reason that birds like and need playthings. A. Well, a big bird needs a big toy, and a small bird, a small toy. If you give the bird the wrong-sized toy, injury is possible. Most toys are labeled for small, medium, large, and extra-large birds. A. Depends on the bird.
Some love bells, some like twirly, spinning toys, some like rawhide leather to chew on.
Wood is a good choice for any bird, it exercises the beak. Fabric is excellent for feather-pluckers. The bird should have a variety of toys, but only two or so in the cage at a time. Rotate the toys about every two to three weeks so the bird doesn't get bored. A. Birds can be taught to do behaviors such as basketball, roller skating etc.