How do you teach a cat no?

How do you effectively teach a cat to understand the concept of "no" and discourage unwanted behaviors? Is it a matter of tone, body language, or both? How can we communicate our disapproval in a way that cats can comprehend and respond to appropriately? What are some common mistakes pet owners make when trying to teach their cats "no"? How important is it to be consistent in enforcing boundaries and what consequences can result from inconsistent messaging? Lastly, are there any specific techniques or training methods that have proven to be particularly effective in teaching cats to recognize and respond to the command "no"?