You can google house plants harmful to cats and find a list of plants to keep away from cats. Also several foods are harmful to cats. Among them are chocolate, grapes and raisins. There are several more, so I would google that also.
A WARNING! Keep all thread away from kitty. A friend of mine had a beautiful Himalayan cat that got hold of a spool of thread and started playing with it. It unrolled and the cat swallowed a good sized length of thread. It wrapped around her intestines. The vet did surgery, but could not save the cat. Thread will cut into a cat or dog's intestines. Be very careful of pins and needles. I just keep everything in drawers or behind cabinet doors. (We just got a new kitten last week after losing our 15 year old Birman cat to cancer in January so I have had to kitten-proof our house again.)