Look at this picture
The kid seems to slide on the edge of the slide, which is dangerous as she may fall off. I want her to slide in the middle of the slide.
What should I say "please slide in the middle of the slide or stay away from the edge"?
But, do we have a common expression that can be used in other situations?
For example, a kid may sit on the edge of a table or a chair, which is dangerous.
Or, someone walks on the edge of a bank which may fall into the river.
DO we say, "please do/go in the middle of... & stay away from the edge"? or Do we have an idiomatic way to express them?