The server code is at root level in ./src.
To compile and run the server, use npm run full.
To run the already compiled server, use npm run serve.
If you want to build the server and not run it, use npm run build.
The client code is in the ./client directory at ./client/src.
To run the development version of the frontent, use npm run start.
To build the production frontent, use npm run build.