This is tutorial is not intended to be a guide for learning C language or about the STM32 platform. It’s primary target is to provide developers a concise guide about integrating peripheral modules and features into active applications.
If you are a beginner, I would recommend you look into an STM32 Project Setup guide like this one.
https://medium.com/vicara-hardware-university/smt32-project-setup-with-cubeide-947974baf713
Interrupts in microcontroller are inputs for external sources or internal processes, which when triggered can stop the currently executing task and run a different sequence of tasks.
The applications range from making real-time response systems to reducing power consumption and it is used in a wide variety of embedded systems.
Interrupts are essentially signals and can arrive at the GPIO pin in one of the following 3 methods
STM32F4 has 7 interrupts
In this tutorial, we discussed the methods for using External Interrupts (EXTI)