Open the terminal and navigate to the same level in the blackstone-backend React app as package.json: blackstone_backend/
Create a file titled .env in this directory and copy/paste the following text, as is, without quotes: PORT=3333 PG_HOST=localhost PG_PORT=5432 PG_DATABASE=meetings_dev PG_USER=postgres
After you've done this, save the file before closing.
Then, open the command line on this same level and type: nodemon
You should see a message that reads: Listening on port 3333
You can open a browser and navigate to the url: localhost:3333
You should see the following message on the browser's page: Welcome to the clients booking API
After you've done this, open the front-end project and follow the README.md file there.