Aggressive behavior in cats, such as scratching and biting, is completely natural. This behavior is never spontaneous, cats never bite or scratch for no reason. In most cases, aggressive behavior is a game or reaction to certain actions of a person.
Cats learn to bite and scratch from birth, this is part of their development. This is how they learn to defend themselves or deal with prey in the wild. For kittens, this is the main form of play, while as an object of attacks they can use any object they come across, be it special toys or the hand of the owner. Thus, the first thing to do is not to accustom the cat to its hand as an object of attack. This is very important, you should not ignore it, otherwise, in the future, aggressive behavior towards humans will become the norm for a cat. If your cat does show aggression and simple stroking leads to scratches and bites, you need to take protective measures against these attacks. Cut her claws regularly to avoid deep scratches in the event of an attack. If the cat pounces on your hand, do not pull it away, she will think that you continue to play with her. Make a short sound loudly and clearly, for example, "ay", but do not yell at the cat and do not scold her, it will not help. A good way to indicate to a cat that her behavior is unacceptable is to grab her by the scruff, as the cat does with her kittens. Hold it in this position for a few seconds and say something at the same time, for example, "no" or "no", then slightly push and release. A cat from the very birth understands such actions, she will know that she is doing something wrong. Cat bites most often indicate that a person does not understand her body language. Stroking a cat is most often accompanied by the fact that it begins to purr, squint its eyes and simply takes a relaxed position. If nothing of the kind is observed in the actions of the cat, perhaps it shows that she does not like something, the continuation of stroking in this case may lead to a bite. Severe fright can also cause bites. If your cat is constantly afraid of something, play with it more often, pet it and try to calm it down, as a last resort, contact your veterinarian for the necessary medications.