1. The document discusses importing data from external sources like text files, databases, and the web into Excel worksheets. It covers the text import wizard, defining connections, exploring data ranges, and defining trusted locations.
2. Methods of sorting and filtering data in Excel are described, including using the sort dialog box, custom sorting, and autofiltering to show only unique values in a column.
3. The document provides guidance on using queries to extract specific data from databases, importing query results into pivot tables and pivot charts, and importing data from XML and web sources into Excel.