How to avoid keyword cannibalization with multiple location pages?

I am relatively new to the world of SEO but know some basics. One of the main questions I had is how to structure a website that has multiple locations. We currently have separate location pages created that have local-specific content only on those pages. Currently, there is not much copy on the homepage, but I would like to add some about us information. I am worried that if I add detailed information on the main page it will cannibalize the current location pages I have. Can I add more information to all these pages without it hurting our rankings?