Idioms with their meaning

Don't judge a book by its cover

-One shouldn't prejudge the worth or value of something based on its outward appearance alone

Kill two birds with one stone

-Achieve two aims at once/Complete two actions in one

Penny for your thoughts

-A way of asking what someone is thinking

Barking up the wrong tree

-Looking in the wrong place/Accusing the wrong person

Beat around the bush

-Avoiding the main issue/Not speaking directly about the issue