You can either run the app in development mode or build and run the docker image for production mode.
For running in development mode, first you need to install all dependencies with npm i or yarn and then just run npm start or yarn start.
If you want to use the docker image instead run the following commands in the terminal.
docker build . -t portfoliodocker run -p 8080:80 portfolio
Once is running you can go to your browser to your localhost:8080