Welcome to this course.
This tutorial shows you how to connect Arduino board with Raspberry Pi, it will take you in a step by step manner to know why this is helpful and how it can make your life away much easier and saves you lots of money.
You will know what is the actual hardware and software configurations needs to be done to make this interfacing work smoothly, you will no longer see your Raspberry Pi damaged or burned by excessive voltage or power source failure, your Raspberry Pi will work like a mini-computer away from the hardware connection that could damage it.
After this course, you will be able to make your own interfacing and the choice is yours to use it in any application that comes in mind since all connections and configurations are explained in detail.