On the help page for Office general you can find instructions that are applicable to all modules, such as working with windows and menus, customising Office, data sources, Gallery, and drag-and-drop.
If you want help with another module, switch to the help for that module with the combo box in the navigation area.
Freezing Rows or Columns as Headers
Deactivating Automatic Changes
Applying Automatic Formatting to a Selected Cell Range
Applying Conditional Formatting
Undoing Direct Formatting for a Document
Formatting Numbers With Decimals
Inserting and Editing Comments
Changing Row Height or Column Width
Copying Formatting With the Clone Formatting Tool
Inserting Line Breaks in Cells
Switching Between Insert Mode and Overwrite Mode
Inserting Non-breaking Spaces, Hyphens and Soft Hyphens
Calculating With Dates and Times
Entering a Number with Leading Zeros
Automatically Filling in Data Based on Adjacent Cells
Recognising Names as Addressing
Referencing Cells by Drag-and-Drop
Addresses and References, Absolute and Relative
Inserting External Data in Table (WebQuery)
Selecting Pivot Table Output Ranges
Defining Print Ranges on a Sheet
Defining Number of Pages for Printing
Printing Sheets in Landscape Format
Printing Rows or Columns on Every Page
Defining Graphics or Colours in the Background of Pages (Watermark)
Opening and Saving Text CSV Files
Importing and Exporting CSV Text Files with Formulae
Importing and Exporting dBASE Files
Saving and Opening Sheets in HTML
Opening documents saved in other formats
Saving Documents in Other Formats
Shortcut Keys (Office Calc Accessibility)
Pasting Contents in Special Formats
Changing Your Working Directory
Freezing Rows or Columns as Headers
Inserting and Editing Comments
Inserting External Data in Table (WebQuery)
Inserting, Editing, Saving Bitmaps Images