What toys should I buy for a kitten?
user
I can tell you a bit about cat toys, but there’s not really an objectively “best” toy for a kitten.  It really depends on what you want to do with your cat.  If you want to play with your kitten, then I would try things that look like prey, like string or stick toys, that can be batted around and chased.  In my experience, young kittens really love to interact with the human who is also playing with them.  

However, if your cat has more sedentary habits, or prefers to be alone, then the goal of play may be something different.  Some cat-owners enjoy having their cat “play” with a ball.  Balls can be a very practical way to exercise a cat.  For cats who are interested in batting things around, this can be an excellent option, if you just put a ball in the cat’s general area.
assistant
What toys should I buy for a kitten?
user
A series of posts on the website Wikipedia suggest that cat toys should be made of lightweight materials with comfy, sturdy bits that the cats can bat around with their paws.  So it sounds like cat toys should probably have wood or plastic in their composition, or maybe be filled with stuffing like cotton or sawdust.  It also sounds like the things should be at least a bit sturdy, so that kittens don’t break them too easily.  They should be lightweight and fun enough that kittens would bat them around for fun.  Lastly, they should have something the kittens can bat them around with, maybe a stuffing or ball inside the toy.  In fact, it looks like most toys have at least a couple of these features in them.
assistant
What toys should I buy for a kitten?