First, you need to create dotenv file in server directory that consists
PORT=...(The port on which you run the server, exmple 8000)
DATABASE=...(Link to the Mongo database)
SECRET=...(Your secret key for jwt)
Then you can run this commands to run server
cd server
npm install
npm run start
and this commands to run client(dev)
cd client
npm run start
cd client
npm run build