NPM Not working

Hi all,

When using npm start I’m getting the following error:

Maxs-MacBook:my-app max$ npm start
npm ERR! missing script: start

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/max/.npm/_logs/2020-06-29T22_56_41_898Z-debug.log
Maxs-MacBook:my-app max$

How do I fix this?