Cats are good students, uhm if what you teach them is for their advantage. So I showed my cats how to open doors, and after a while they jumped to open and then pushed or pulled.
My cats mostly talked to me 2, they meowed and when i was close the ran some untill i was close again and so on untill she was standing at the door of where we keep the food, same when they are outside and want to come in, they meow 1 or 2 times, wait and meow again, if nobody opens she know none is home and goes to hide under some cover.
Cats are the cutest !!