Windows Excel shortcuts on a Mac
Windows shortcuts work in Excel on a Mac with RibbonKeys: it draws the Alt-key letters over the ribbon, and Option stands in for Alt. Tap Option, then type the sequence you already know, such as H O I to fit the column width.
They are the Alt-key shortcuts from Excel for Windows, including the items of a dropdown. Esc steps back one level, and the Excel 2003 menu keys work, such as E S for Paste Special. H O I fits the column width, H V V pastes values, and W F F freezes panes.
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Needs macOS 13 or later and Excel for Mac.