During lockdown... the first 21 days... Learning Microcontrollers in 21 videos

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.