Oracle APEX is a fantastic web-dev tool because:
Everyone wants their apps to run in a browser, even if the app isn’t exposed to the internet (i.e. it’s used within/on a company network). Well, APEX provides an easy way to get started and build simple web-based applications. You do not need to learn Php, HTML, Javascript, etc.
Applications without data are not very useful. APEX provides easy access to the one of the most popular databases in the world, Oracle.
The Oracle RAD stack is an inclusive technology stack based on three core components: Oracle REST Data Services (ORDS), Oracle APEX, and Oracle Database.  This stack provides all the necessary components to develop and deploy world-class, powerful, beautiful, and scalable apps. There are no other moving parts of additional components required.