I have a document with several artboards (7), which I resized, but now my grid (cmdâ€“") is not centered or zeroed correctly (please see photo). I need to adjust the elements on the artboards, and I need the grid to zeroed correctly, otherwise there's no point in using it. Any and all help is greatly appreciated!
Your document is set to display 'Global rulers', and one ruler applies to the document. While using global rulers you can double-click the origin point to reset the global ruler to the top-left of the selected artboard.
From the menu choose
View > Rulers > Change to Artboard Rulers (Command/Ctrl+Option/Alt+R) to switch to Artboard rulers which will allow you to reset the coordinates for each artboard.