Npm run develop not found

Questions and Answers
4

You shouldn’t be using this version, any of the alphas will almost certainly be broken badly. The current version is v3.6.6

Also your npm version should v6, not v7. We won’t support Node 16/NPM v7 until the upcoming Strapi v4 release.

The npm run develop or yarn develop is assuming you sitting in the root directory of the Strapi project as it’s just a short code to run a script from the package.json:

"scripts": {
    "develop": "strapi develop",
    "start": "strapi start",
    "build": "strapi build",
    "strapi": "strapi"
  },