It can make our work quicker, if we execute most of the tasks from the keyboard, and use the mouse less frequently.
If someone is familiar with a few keyboard shortcuts, he/ she will know the name is not given by chance.
With one of my colleagues we created a reminder note, which contains the Microsoft Excel hotkeys for the moves. You can print it on a normal sheet, and put it next to your monitor, to be in view, so you can learn it easily.
Please click on the link to download it: http://www.access-excel-vba.com/ms_excel_keyboard_shortcuts.pdf
The keystrokes works with OpenOffice Calc too.
Other useful resources:
http://exceltip.com/news/excel-shortcut-heaven.html
http://tricks-4-fun.blogspot.com/2008/09/best-excel-shortcuts.html