An introductory video (youtube) by bytebodger describing the use and creation of pivot tables in Excel 2007.
Here is a video from freetutorials (youtube) on using Excel to manage simple databases.
The REPT function repeats text a given number of times. For example, =REPT(”*”,10) repeats * 10 times in a cell.
You can use this function to create a simple bar for values in multiple cells. Here is a short video on YouTube: