Easy

What can you hold in your left hand but can never hold in your right hand?

related riddles

I'm a starchy plant tuber that is one of the most important food crops, cooked and eaten fried, such as french fries.

What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.

The more you have of me, the less you see. Who am I?