put all one's eggs in one basket

put all one's eggs in one basket
Fig. to make everything dependent on only one thing; to place all one's resources in one place, account, etc. (If the basket is dropped, all is lost.) 
Don't invest all your money in one company. Never put all your eggs in one basket. I advise you to diversify and not to put all your eggs in one basket.

put all your eggs in one basket
to risk losing everything by putting all your efforts or all your money into one plan or one course of action If you're going to invest the money, my advice would be don't put all your eggs in one basket.

put all your eggs in one basket
to risk your money or your reputation in support of one idea or plan I didn't want to put all my eggs in one basket, so I played five different lottery games, but lost all of them.
Etymology: based on the idea that if all the eggs you got from your chickens are in one basket ( container) and you drop it, you will lose all your eggs