Footnotes? well, we don't use the word in WikiTree. But you will often see profiles copied from other systems which have a footnote section, often in WT heading format. So, part of your task as a ref-fixer will be to decide how to convert them to a standard WT format. First split them into separate notes, and work out whether they are really (a) citations, so code them as refs, or (b) notes about the research done, problems, decisions etc. - put these under a separate ==Research Notes== heading just before ==Sources==