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In my understanding, you'll use the assembler for your programming.
Because you find some infos for instruction code.
Please check below linx. you may find useful/good online book for PIC. https://www.mikroelektronika.co.yu/english/product/books/PICbook/picbook.htm
I also attached small example asm code for this book, you also can get
some example above linx.
Hope to be a useful.