SheetKeys
SheetKeys adds powerful keyboard shortcuts to Google Sheets, in the spirit of the Vim text editor.
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Summary
If you are a project manager, programmer, finance person, or just someone who uses spreadsheets a lot, this can greatly increase your efficiency in Google Sheets.
After installing, you can see and customize all of the keyboard mappings by typing "?" while on a Google Sheets page.
Here is a partial list of shortcuts, and their default key assignments:
Movement:
j Move cursor down k Move cursor up h Move cursor left l Move cursor right
<C-J> Move rows down <C-K> Move rows up
Safety
Risk impact
SheetKeys may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
Risk likelihood
SheetKeys may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.