The Arduino website remains the primary source for the official Arduino IDE software, which you can use to write and upload code. Key Programming Features Covered in These Resources
Most educational Arduino PDFs focus on these primary features: An Introduction To Arduino - GoTronic Download Programming with Arduino pdf
For those interested in the underlying hardware and the C/C++ language specifics, the Microcontroller Programming with Arduino and Python manual from IIT Bombay covers board history and hardware organization. The Arduino website remains the primary source for
The Programming Arduino: Getting Started with Sketches PDF provides a thorough breakdown of core programming features, including functions, global and local variables, and coding styles. global and local variables