• Cell Basics
• Modifying Columns, Cells and Rows
• Formatting Cells
• Simple Formulas
• Complex Formulas
• Functions
• Sorting Data
• Filtering Data
• Tables

A little more advanced content here: 

• Tables
• Charts
• Conditional Formatting
• Pivot Tables Part 1
• Pivot Tables Part 2

And some basic statistics too: 

• Mean, Median, Mode and Range
• Mean, Median, Mode and Range II
• Chosing the Best Measure of Central Tendency