Good eggs

To egg someone on is to encourage that person to do something risky or foolish.
• She did the bungee jump after her friends egged her on.

To have egg on one's face is to have been made to appear foolish or ridiculous.
• After claiming he could beat everyone, he had egg on his face when he lost.

To put all your eggs in one basket is to risk all you have on success in one area.
• It's important to diversify your investments. Don't put all your eggs in one basket.

To kill the goose that lays the golden eggs is to destroy a reliable source of income.
• To take resources away from the company's core products would be killing the goose that lays the golden eggs.

A good or bad egg is a person of fundamentally good or bad character.
• Your daughter always does the right thing. She's a good egg.

A chicken-and-egg situation is one in which each of two things appears to cause the other.
• Who started this fight? I don't know. It's a chicken-and-egg situation.