F2 - Formula Bar
Ctrl+F2 - Insert Fields
F3 - Complete AutoText
Ctrl+F3 - Edit AutoText
F4 - Open Data Source View
Shift+F4 - Select next frame
F5 - Navigator on/off
Ctrl+Shift+F5 - Navigator on, go to page number
F7 - Spellcheck
Ctrl+F7 - Thesaurus
F8 - Extension mode
Ctrl+F8 - Field shadings on / off
Shift+F8 - Additional selection mode
Ctrl+Shift+F8 - Block selection mode
F9 - Update fields
Ctrl+F9 - Show fields
Shift+F9 - Calculate Table
Ctrl+Shift+F9 - Update Input Fields and Input Lists
Ctrl+F10 - Nonprinting Characters on/off
F11 - Styles and Formatting window on/off
Shift+F11 - Create Style
Ctrl+F11 - Sets focus to Apply Style box
Ctrl+Shift+F11 - Update Style
F12 - Numbering on
Ctrl+F12 - Insert or edit Table
Shift+F12 - Bullets on
Ctrl+Shift+F12 - Numbering / Bullets off
Alt+Arrow Keys - Move object.
Alt+Ctrl+Arrow Keys - Resizes by moving lower right corner.
Alt+Ctrl+Shift+Arrow Keys - Resizes by moving top left
corner.
Ctrl+Tab - Selects the anchor of an object
Other important Shortcut keys for Libreoffice
Ctrl+A - Select All
Ctrl+D - Double Underline
Ctrl+E - Centered
Ctrl+F - Find and Replace
Ctrl+Shift+P - Superscript
Ctrl+L - Align Left
Ctrl+R - Align Right
Ctrl+Shift+B - Subscript
Ctrl+Y - Redo last action
Ctrl+0 - Apply Default paragraph style
Ctrl+1 - Apply Heading 1 paragraph style
Ctrl+2 - Apply Heading 2 paragraph style
Ctrl+3 - Apply Heading 3 paragraph style
Ctrl+5 - 1.5 Line Spacing