If you had the project in some version control (gitlab, github, etc) and came back to clone it, you should do a
npm install
to download all the dependencies that it needs to work, if you are looking to run your project in development mode, use the angle CLI using the command
ng serve
That will raise a local server and you can run your project usually at the address link (noting that you have not modified the angle-cli. json), on the other hand if what you want is to put your project into production you must compile the project in order to upload it, if this is your case, use the command
ng build --prod
that generates a folder / dist in the root of your project that is what you need to upload to your production server