What's the meaning of this idiom?

A different kettle of fish.

Any issue or matter that is entirely different in scope, description, or nature from that which was just being discussed.

Explanation:  Hope this helps!

honestly you should not write it the word placement is not right and this does not sound right so i think you should write it this way. the life lessons i refused to learn, taught me the hard way this sounds way better you should try it! hope this is very !

being untruthful

eating too much

overstaying one's welcom

this is that correct answer.