Link for MS-Excel Shortcuts

For Excel Short cuts- http://www.bmedia4tech.com/2013/11/15/139/Here-are-75-Excel-Shortcuts-tips-to-improve-your-skill

For Excel Formulas

Go- http://www.bmedia4tech.com/2013/12/05/166/34-Excel-Formulas-and-Functions-You-Should-Definitely-Know

 For Understanding Formulas

http://www.bmedia4tech.com/2013/11/26/150/Excel-Tips-4-Understanding-Formulas-Basic-Formulas-with-Examples