If you are interested in learning about Microcontrollers then this may be of interest to you. If you want to flash that LED through to some complex programming see https://www.youtube.com/playlist?list=PLN9gcw34mhurcKllCY1ArcuX0F4Zdcmkh
Ask questions, as many as you like. I develop the compiler and the tool chain here in Surrey. We support over 1000 8-bit microcontrollers from Microchip - they can be AVR or PIC and the code you write is portable across the microcontrollers.