If still relevant, once I was given a sort of manual while studying coding in university. It had quite a detailed explanation on some peculiarities of coding process yet I think it might lack some general information. Especially there was a considerable chapter on detecting and correcting data errors yourself. I personally found it rather practicable when I had to remove errors caused by faulty processing. As far as I remember, the manual was done by one of our professors on docsie.io . I guess looking through such manual might help to find a solution as long as errors aren`t caused by human mistakes.