4 month old kitten, Megabyte, learns to sit. If he can do it, so can your kitty. Since all cats are motivated by food, you can use this to your advantage.
I trained my kitty by pushing his hips down while saying “sit.”
Others have lifted the treat above the cat’s head so he has to sit and tilt his head up to keep the treat in view.
Don’t forget the bridge “Good boy” or equivalent right when the cat does the action you want. Be consistent. You should say it only when the kitty does the exact move you want and you should always say the same thing.