The "BOLD, revert, discuss cycle", or the BRD cycle, is a common method that editors use to get past disputes and find consensus (see week 9: "How Consensus Works").
A contributor boldly makes an edit to a Wikipedia article because they think it's a worthwhile and correct change. Another contributor who disagrees with this change may then revert it—Wikipedia's term of art for hitting "undo". If anyone, including the first editor, disagrees with the reversion, the best thing to do is resolve the matter through discussion with others, and make edits on this aspect of the page only after consensus forms.
Sounds simple, right? It is, in theory. In practice, debates over content can be contentious, and the cycle isn't always followed. (This can result in edit wars.) But by knowing about the process and following it, you'll get started on the right foot.