Navigating with the arrow and end key
Selecting multiple rows for deletion
Inserting rows/columns without changing existing formulas
Any of the myriad key/mouse navigation techniques used in Excel
A simple compilation of Calc commands that mirror or emulate Excel commands
You can find what are for LIbreOffice in:
https://help.libreoffice.org/Calc/Shortcut_Keys_for_Spreadsheets
https://help.libreoffice.org/Common/General_Shortcut_Keys_in