@NogDogMay 27.2019 — #Ports in that range have no special meaning/purpose -- they can be used for whatever you want. Whichever one you pick is the port that application will listen on, so if you're trying to access it from your browser, you would add :3000 to the domain being used (or whichever port number you chose).
@VITSUSAMay 28.2019 — #You can launch the live server in different ports, from 3000 to 9000 (by increments of 1000), but what do you want exactly? After that we can suggest you best possible answer to fulfill your requirements.