Sh-<Space>: Select Row / Table Row
Ctrl-<Space>: Select Column / Table Column
Ctrl-<Star>: Select contiguous cells
F8: Select mode
Sh-F8: Add select
Cmd-<Plus>: Insert Cells, Rows, Cols (quantity of whatever is selected)
Cmd-<Minus>: Delete Cells, Rows, Cols (whatever is selected)
Ctrl-<Up, Down, Left, Right>: Go to next boundary of contiguous cells
Ctrl-<Home>: Go to top-left corner
Ctrl-<End>: Go to bottom-right corner (outermost modified cell)
Opt-<PageUp, PageDown>: Move one screen left / right
Opt-Cmd-R: Toggle Ribbon
Opt-Left / Right: Switch to Prev / Next Worksheet Tab
Ctrl-F: Find
F2: Edit cell contents
Cmd-D: Fill (or copy) down
Cmd-R: Copy Right
Sh-F3: Formula Builder
Opt-Cmd-<Equals>: Autosum
Ctrl-<Semi>: Insert current date
F2: Toggle between Point and Edit mode
F4 / Cmd-T: Cycle through Absolute, AbsRow, AbsCol, Relative addressing
Cmd-R: Align Right
Tab: Tab-complete selection drop-down
Cmd-T: Create Table
Sh-Ctrl-L: Toggle Table Filter buttons
Name columns, ranges, as well as cells. They work like worksheet-level Table refs
Ctrl-G / F5: Goto Name
F3: Paste Name
Ctrl-L: Define name
Cmd-F3: Define Name dialog
Sh-Cmd-F3: Create Names dialog
Insert > Name > Define Name...
Ctrl-1: Format Cells dialog
Ctrl-~: General Format
Ctrl-!: Number Format: 0,000.00
Ctrl-@: Time Format
Ctrl-#: Date Format
Ctrl-$: Currency Format
Ctrl-%: Percentage Format
Ctrl-Cmd-V: Paste Special
Ctrl-E: Flash fill
Sh-F10: Context menu
Ctrl-[: Select only cells that are directly referred to by formulas in the selection
Ctrl-{: Select all cells that are directly or indirectly referred to by formulas in the selection
Ctrl-]: Select only cells with formulas that refer directly to the active cell
Ctrl-}: Select all cells with formulas that refer directly or indirectly to the active cell
Edit > Paste Special: Add adds value from clipboard to paste rangeINDEX & MATCH instead of VLOOKUP, HLOOKUP