How to make targets for spells not to work on heroes?

How to make targets for spells not to work on heroes?

I want a spell like storm bolt to only hit normal units, not to hit heroes but how? Is there a way to use triggers to do it?

Add Non-hero to targets allowed in the spell editor, there is a way with triggers, but that only takes time.

Yeah TheWickerMan is right just go into the spell down to Targets Allowed and do Non-Hero