The minimum set of technologies required to create a web application includes:
HTML: HyperText Markup Language is frequently used for creating web pages. It provides the structure and content of a webpage.
CSS: Cascading Style Sheets is a stylesheet language used for stylizing elements written in HTML. It provides the visual layout and appearance of a webpage.
JavaScript: a scripting language that adds interactivity and dynamic functionality to web pages. It allows developers to create dynamic effects, validate forms, and perform other functions on a webpage.
Web Server: a software program that processes HTTP requests and delivers web pages to users. It is responsible for serving web content to clients.
These technologies are the essential building blocks of any web application. However, depending on the application's complexity and requirements, you might need to implement the latest web development trends with other technologies such as databases, server-side scripting languages, and frameworks.