I hate the term 'naughty mat' but can't think of another name of it.

I've seen parents who do the "sit there/naughty spot" method and they have some of the best behaved kids I've seen.

How do I introduce it. We used to use a light tap on the hand when DD acted up. She's taken to hitting back, so we've stopped. If she's naughty (ie, touching something) then she is sat down and told "No. Do not touch".

How do I introduce to the naughty spot/mat/sit there method?
Any parenting advice would be appreciated.

DD is turning into a brat, she plain out ignores us saying No we need to do something.

She's 13 months (11 corrected).

Help, please.