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If you are just starting then this is where to be. It has highly simplied tutorials written such as to fully engage the reader . Tronixstuff Tutorial || Created by John Boxall

If you are an Engineer or someone trying to dig deep into what Micro-controllers are then follow this link. It is based on 8051 Microcontrollers . Architecture and Programming of 8051 Microcontrollers || Created by Milan Verle

Sparkfun's tutorial that would give you an overview of what Micro-controller is and AVR toolchain. AVR Overview || Created by Nate