This free online Excel class is being taught as part of University of Reddit created with the goal of helping you learn Microsoft Excel. Lessons in following categories are available: Data Input & Manipulation, Pivot tables, Functions and Formulas, Macros/VBA.
Very good video lectures/tutorials for any level of Excel user. Pivot tables and formula lessons are must have for accountants, auditors, and business analysts. Even more, there are live forums where you can find an answer to your question or ask for help.