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Hi, I only have a bit of experience with PIC mcu's and I really learned a lot from this site PIC Tutorial
I learned how to program using assembly language at first since it helped me understand how the PIC mcu's work
It would help if you mentioned which MCU you are interested in and in what language...
In any case, if it happens to be AVR or PIC, there are some books and online tutorials mentioned in the following thread. https://www.edaboard.com/threads/237261/