Quick Keystroke "Shortcuts" for Excel:
[F1] Help
[F2] Opens current cell for editing
[F4]  Toggles the lock symbols on the referenced cell nearest the cursor (|)
[Alt] + [F8] Open Macro Window
[Alt] + 155 ¢
[Alt] + 167 º
[Alt] + 171 ½
[Alt] + 172 ¼
[Alt] + 174 «
[Alt] + 175 »
[Alt] + 179 ¦
[Alt] + 225 ß
[Alt] + 227
[Alt] + 230 µ
[Alt] + 241 ±
[Alt] + 246 ÷
[Alt] + 248 °
[Alt] + 249
[Alt] + 250 ·
[Alt] + 253 ²
[Alt] + 380 |
[Alt] + 390 å
[Alt] + 399 Å
[Alt] + 411 ¢
[Alt] + 143 Å
[Alt] + 0174 ®
[Alt] + 0169 ©
[Alt] + 0153
[Alt] + 0176 °
[Alt] + 0177 ±
[Alt] + 0178 ²
[Alt] + 0179 ³
[Alt] + 0181 µ
[Alt] + 0182
[Alt] + 0183 ·
[Alt] + 0149
[Alt] + 0134
[Alt] + 0135
[Alt] + 0150
[Alt] + 0189 ½
[Alt] + 0190 ¾
[Alt] + 0215 ×
[Alt] + 0247 ÷
[Alt] + 0223 ß
[Ctrl] + C  Copy Selected Text
[Ctrl] + X Cut Selected Text
[Ctrl] + V  Paste Text Previously copied or pasted
[Ctrl] + Z  Undo previous Action
[Ctrl] + Y Redo last "undo"
[Ctrl] + S  Save current file (Same as selecting the disk)
[Ctrl] + U Underline selected text (or entire cell)
[Ctrl] + B Bold Selected text (or entire cell)
[Ctrl] + I  Italicize Selected text (or entire cell)
[Ctrl] + [Shift] + P Select the font size Window
[Ctrl] + F Find text
[Ctrl] + 1 Format the Selected Cell(s)
[Ctrl] + [Shift] + [+] Insert(add) Line, column, or cell
[Alt] + [Tab] Toggles Windows (holding the [Alt] key and tapping tab will let you select the window)