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Theory:

LibreOffice Calc is the spreadsheet part of LibreOffice.
 
Spreadsheets enable us to organise, analyse, and store data in tabular form. Furthermore, in a spreadsheet, we can manage this data to produce specific results.
 
LibreOffice Calc Keyboard Shortcuts:
 
Below is a list of LibreOffice Calc keyboard shortcuts.
 
Shortcut Key
Effect
\(Alt+C \)
Copies or moves the current field into the “column” area
\(Alt+ D \)
Copies or moves the current field into the “data” area
\(Delete \)
Removes the current field from the area
\(Down Arrow \)
Moves the focus down one item in the current dialog area
\(Down Arrow \)
Moves the current field down one place
\(End \)
Selects the last field in the current layout area
\(End \)
Move the current field to the last place
\(Home \)
Selects the first field in the current layout area
\(Home \)
Moves the current field to the first place
\(Left Arrow \)
Moves the focus one item to the left in the current dialog area
\(Left Arrow \)
Moves the current field one place to the left
\(Alt +O \)
Displays the options for the current field
\(Alt + R \)
Copies or moves the current field into the “row” area
\(Right Arrow \)
Moves the focus one item to the right in the current dialog area
\(Right Arrow \)
Moves the current field one place to the right
\(Tab \)
Changes the focus by moving forward through the areas and buttons of the dialog
\(Shift+Tab \)
Changes the focus by moving backwards through the areas and buttons of the dialog
\(Up Arrow \)
Moves the focus up one item in the current dialog area
\(Up Arrow \)
Moves the current field up one place
\(Alt + Down Arrow\) 
 Increases the height of current row
Reference:
https://help.libreoffice.org/4.4/Calc/Shortcut_Keys_for_Spreadsheets