Every language has its own collection of wise sayings. They offer advice about how to live and also transfer some underlying ideas, principles and values of a given culture / society. These sayings are called idioms - or proverbs if they are longer. These combinations of words have (rarely complete sentences) a 'figurative meaning' meaning, they basically work with "pictures". 

This List of commonly used idioms and sayings (in everyday conversational English), can help to speak English by learning English idiomatic expressions.

• A hot potato

Speak of an issue which many people are talking about and which is usually disputed

• A penny for your thoughts

A way of asking what someone is thinking

• Actions speak louder than words

People's intentions can be judged better by what they do than what they say.

• Add insult to injury

To further a loss with mockery or indignity; to worsen an unfavorable situation.

• An arm and a leg

Very expensive or costly. A large amount of money.

• At the drop of a hat

Without any hesitation; instantly.

• Back to the drawing board

When an attempt fails and it's time to start all over.

• Ball is in your court

It is up to you to make the next decision or step

• Barking up the wrong tree

Looking in the wrong place. Accusing the wrong person

• Be glad to see the back of

Be happy when a person leaves.

• Beat around the bush

Avoiding the main topic. Not speaking directly about the issue.

• Best of both worlds

All the advantages.

• Best thing since sliced bread

A good invention or innovation. A good idea or plan.

• Bite off more than you can chew

To take on a task that is way to big.

• Blessing in disguise

Something good that isn't recognized at first.

• Burn the midnight oil

To work late into the night, alluding to the time before electric lighting.

• Can't judge a book by its cover

Cannot judge something primarily on appearance.

• Caught between two stools

When someone finds it difficult to choose between two alternatives.

• Costs an arm and a leg

This idiom is used when something is very expensive.

• Cross that bridge when you come to it

Deal with a problem if and when it becomes necessary, not before.

• Cry over spilt milk

When you complain about a loss from the past.

• Curiosity killed the cat

Being Inquisitive can lead you into an unpleasant situation.

• Cut corners

When something is done badly to save money.

• Cut the mustard

To succeed; to come up to expectations; adequate enough to compete or participate

• Devil's Advocate

To present a counter argument

• Don't count your chickens before the eggs have hatched

This idiom is used to express "Don't make plans for something that might not happen".

• Don't give up the day job

You are not very good at something. You could definitely not do it professionally.

• Don't put all your eggs in one basket

Do not put all your resources in one possibility.

• Drastic times call for drastic measures

When you are extremely desperate you need to take drastic actions.

• Elvis has left the building

The show has come to an end. It's all over.

• Every cloud has a silver lining

Be optimistic, even difficult times will lead to better days.

• Far cry from

Very different from.

• Feel a bit under the weather

Feeling slightly ill.

• Give the benefit of the doubt

Believe someone's statement, without proof