Choose your Platform: full shortcut list + printable PDF
Windows and Linux Ctrl as the primary modifier, Alt for tool windows (Alt+1 through 0) and window stretching. Linux uses the exact same default keymap as Windows.
Mac Cmd as the primary modifier for most editing and navigation, but Ctrl for a few platform-level actions (Refactor This is Ctrl+T, not a Cmd chord). Option handles word-by-word caret movement and window stretching.