How do I reinstall my App Store on my home page? I deleted it in error

Use App Library to search the App Store app, see-> Organize the Home Screen and App Library on your iPhone

Organize the Home Screen and App Library on your iPhone - Apple Support           

• If you have find the App Store app, tap & hold on the app, then drag to the Home screen & drop it.

Go to the App Library on your device. It will be the last screen on the phone. Do a search for the app. It will appear in the search. When you find it, you can drag it to the Home Screen.