This may be an instinctive behavior of the cat or it is expressing certain emotions. Cats may slap people for the following reasons: they may be playing or practicing hunting; they feel threatened or unsafe; they hope to arouse the owner's anger. Attention; physical discomfort or pain; territoriality; emotional issues. If your cat frequently hits people for no reason, you can take the following measures:

Observe its physical condition, Are there any abnormalities?

Increase interaction with it and satisfy its attention needs.

Provide adequate space for toys and activities.

Ensure its living environment is safe and comfortable.

If the problem persists, consult a veterinarian or a professional animal behavior consultant.