A Data Science Central Community
Listed on my personal website www.markmcilroy.com is my book titled 'A guide to writing Excel formulas and VBA macros'. The book is available for free download in PDF format. It is also available in print from Amazon.com.
Excel is widely used for all forms of data analysis once the bulk of the data has been processed and summarised using a tool such as SAS, SQL, etc.
While this book is relatively small it includes an overview of key information required to write Excel formulas, and also an introduction to Excel VBA macro programming.