"Metadata" is the bibliographic information. This includes details like the type of item (article, book chapter, video recording, website), author/director/contributor, title, source URL, notes, tags, etc.
When saving items using Zotero, the metadata is automatically downloaded and saved, but this information may contain errors or might be missing important information needed for accurate citing.
It is important that you examine the bibliographic info produced with Zotero for accuracy, double check:
Also, look for any missing information that is needed to create accurate citations. You should make the adjustments to items in your Zotero Library before creating in-text citations/footnotes or building reference lists.
The edits made are automatically saved as you work. Click the sync icon to sync changes made in the standalone app with your online zotero.org library.
When making edits online at zotero.org
This brings you to the items detail page. From here, click the Edit icon and make the needed changes.
Preview the citation by clicking Cite icon