reference+material+2

More complex material:

Pivot table step-by-step http://www.wikihow.com/Create-Pivot-Tables-in-Excel

complex formulas http://office.microsoft.com/en-us/excel-help/examples-of-complex-criteria-HA001218694.aspx

conditional formatting: http://excel.tips.net/C0186_Conditional_Formatting.html

VLookup formula use: http://www.youtube.com/watch?v=GZX2iXfqALs