You can use a clicker to train your cat, it allows you to reward your cat for positive actions.
Like, using a scratching post, the clicker lets the cat know that you like what it did, give your cat a treat.
Cats don't work for free. Put a treat that your cat likes and when the cat's rear end goes down say “Sit” and give it a treat. Once your cat knows how to sit, teach the cat to stay, sit on the hind legs. Practice this a few times a week.
It is very important that your cat comes when you call it, in case of an emergency. Use a bell or a whistle. The cat can hear the sound from a distance. You can give your cat a bit of deli chicken or turkey for a treat when it comes. Practice this method in different parts of the house. When your cat knows this command, you can practice once a month or more. Be consistent. It is also good for when you are not there, other people can use the same method to have your cat come to them.
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