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Under the hood
Under the hood means something that is hidden under the surface of a complex system. If you need to look under the hood of something you are investigating its internal workings.This idiom is used most commonly to talk about hidden details of a system, software or an organization. It draws from the image of opening a car's hood to look at the engine.
Under the hood, it is running linux.
Upset the apple cart
You upset the apple cart when you ruin someone's plans, or disrupt the normal operation of something.This idiom came from the literal image of a cart of apples being tipped over at the markets, causing chaos and disruption.
We were going to hold the party outdoors, but a storm came and really upset the apple cart.
Use your head
If you tell someone to use your head or use your noggin it means they should think clearly and rationally about something instead of making impulsive or emotional decisions.Use your head before making that choice.