Microsoft Excel is a spreadsheet application and has been widely used these days. Most of Management Information Systems (MIS) reports are prepared in Ms. Excel
To sharpen your skills in Excel, I would recommend you to visit the following website
This does not come with attractive screen shots. A dull appearance in front of your eyes but provides very good examples on excel commands and functions. The option “excel tips” (A-Z) in this website gives you self-explanatory notes on various excel commands with the screenshots. The series of steps involved is mentioned in detailed manner and gives you an idea about what would be the NEXT, NEXT & NEXT whilst you are involved with the processes. There is also an option “excel files” which enables you to download the sample excel files. You can download these files on your system and learn on your own.
I learned a lot from this website.