Excel Pivot Tables
Pivot Tables can be one of the most powerful data summarization and management tools you can learn. A recent job search using "pivot tables" as a keyword, yielded over 50 jobs that required knowledge of pivot tables. Often, tables of data are presented with 100s - even 1000s of rows and pivot tables provide a way to "slice and dice" and reorganize the data in a few keystrokes.
I can train you to how, when, and why you should use pivot tables. If you are a business person, I can design spreadsheet models using pivot tables for your job.
Learn pivot tables. It's a real time saver.