quirks and traits of cats - ReYep
Everything they do is actually strange to us humans, otherwise what they do in a very natural cat's world.

For example, waving a tail can be a sign of happiness or anger.

Rubbing a person's feet, means I trust you can you give me food? Or can we play (if it's a small cat)?

jumping on hanging objects such as necklaces, earrings and threads are the actions they take to satisfy their hunting instincts.

and scratching, biting their nails, or scratching carpets is purely a product of their desire to bury their excrement.

The desire to sleep on places such as computers, adapters or car engines is purely because they like to sleep in warm places.