Ctrl as primary modifier. The full Google Sheets shortcut set on ChromeOS uses Ctrl throughout, matching Windows. Data range navigation (Ctrl+Arrow), selection extensions (Ctrl+Shift+Arrow), paste values only (Ctrl+Shift+V), and all other Ctrl-based shortcuts apply here as on Windows.
Built-in shortcut list. Ctrl+/ opens Google Sheets' shortcut reference panel on ChromeOS, the same as on Windows. This is the fastest in-app shortcut lookup available.
The Search/Launcher key. Chromebooks replace the standard Caps Lock key with the Search/Launcher key. This key appears in ChromeOS system shortcuts but rarely in Google Sheets-specific shortcuts. Knowing it's in the Caps Lock position helps if you're looking for that key.
Chromebook keyboard and the top row. Chromebook keyboards use the top row for system controls (brightness, volume, refresh, fullscreen) rather than F-keys. Google Sheets on ChromeOS uses Ctrl-based shortcuts rather than F-key shortcuts, so this doesn't create gaps in spreadsheet shortcut coverage. The table above notes any cases where this matters.
Data range navigation. Ctrl+Arrow jumps to the last filled cell in any direction, one of the most valuable shortcuts for working with real data on any platform. This works the same on ChromeOS as on Windows.
Menu access. Alt activates menu navigation in Google Sheets on ChromeOS, giving keyboard access to all Sheets features, the same as on Windows.