Statistics Teacher Needed

I need someone to teach me business statistics, especially Skewness and Kurtosis.
I am a doctorate student doing my research on the stock market and all the research papers are giving a 10-day mean return on investment along with the Skewness and Kurtosis numbers to describe the sample.

I don't understand the formulas or steps to calculate them.
Your task would be to read the paper and explain to me with simple examples on how those calculations are done

Since it's for my doctoral program, I am sure I will need lot more help in future hence it can be a long term project for you