How to deploy a web Application in different use cases

Say I have built a mean stack application for a college. And say the end users want to access the application anywhere in the campus. How and where do i deploy the code. What are the different options available for deployment. Can someone explain me in detail how the deployment works and how do I implement the above scenario.

and say after some time if the users requirements change and they would like to access the web application from any where across the globe. How and where do i deploy the code.

I have three servers running, i.e angular, node and mongo servers. How exactly do i deploy the whole application.

thank you in advance for your patience in reading and answering the question.