Choose your Platform: full shortcut list + printable PDF
Windows and Linux Ctrl is the modifier throughout, and most bindings match between the two, but a few tab and calendar shortcuts genuinely differ (Windows leans on Ctrl+1 through Ctrl+9 for tabs, Linux uses Alt+1 through Alt+9).
Mac Cmd replaces Ctrl for most shortcuts, but calendar tab switching and a few edit commands use the literal Control key instead, and some Windows/Linux-only shortcuts (menu bar, context menu key) have no Mac equivalent at all.