Well, from the little I know about science, if the earth stops rotating, depending on where it stops, we might have eternal day or eternal night if it was far from the sun.

Secondly other planets rotating might crash into the earth and thereby destroying the earth.

Plants would stop growing because they need photosynthesis to grow and when there is no sun that process would not take place.

Our eyes would automatically adapt to the night and we might start seeing like bats.

That's all I can think of that'll happen if the earth stops rotating.