Scratching cannot be trained away, only redirected
Because scratching meets several real physical and emotional needs at once, trying to eliminate it entirely is not a realistic goal. A much more effective approach is accepting that your cat will scratch something, and making sure that something is a scratcher rather than your furniture.
Pair this with a comfortable litter box setup
Getting the placement right matters for both a scratcher and a litter box, since both work best when positioned somewhere your cat naturally feels comfortable. It is worth reading up on litter box setup at the same time you are working on scratcher placement.
Frequently Asked Questions
If I use soft nail caps, do I still need a scratching post?
Yes. Nail caps cover the tip of the claw to reduce damage to furniture, but the scratching behavior itself continues regardless, and a cap does not satisfy the claw-maintenance or stretching need behind it, so a scratcher is still necessary.
My cat completely ignores the scratcher.
This usually means the material or shape simply is not to their taste. Try switching to a different type, sisal rope, cardboard, vertical, or horizontal, add a little catnip to spark interest, and move it into a spot your cat actually spends time in.