C++ is a very widely used & powerful language. We can see it in our ObjC, Swift and Arduino projects. So here is some great content from Udemy on C++ for anyone interested in the basics of C++:
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Learning C++ @Udemy
Santiapps - Arduino, Raspberry Pi, Python, Internet Of Things, IoT, iOS, AndroidProgramming smart devices with the cloud for robotic intelligence solutions using Arduino, Raspberry Pi, Python, iOS, Android Internet Of Things Tank