Because this app is made of two npm projects, there are two places to run npm commands:

1. Node API server at the root ./
2. React UI in client/ directory.

In a terminal:

# Initial setup
npm install

# Start the server
npm start

npm install package-name --save

The React app is configured to proxy backend requests to the local Node server. (See "proxy" config)

In a separate terminal from the API server, start the UI:

# Always change directory, first
cd client/

# Initial setup
npm install

# Start the server
npm start

# Always change directory, first
cd client/

npm install package-name --save