This 50+ page PDF contains everything that an investor would want to know about the RElative Strength Index indicator. Coverage areas include. 
 
RSI Basics
Covers the basic theory and components of RSI. This chapter is a must for those new to RSI. 
 
RSI Inside the Numbers
Dives deeper into the RSI calculation method and looks at some pricing oddities. Although heavily mathematical and somewhat theoretical, this chapter has value for professionals, hardcore technicians and those whose quest is to know everything about RSI.
 
RSI Advanced Interpretations
Reviews some of the more esoteric, or less known but insightful, applications for RSI. Although this chapter may seem advanced, it will likely benefit all users of RSI. 
 
RSI Performance Study 
Looks at the results from an extensive study showing how RSI backtested over a 13-year period on every stock in the S&P 500 index. Insights from this study include which RSI overbought and oversold levels and time periods performed best and what application techniques resulted in the highest returns and lowest risk. Spoiler alert: It’s not what is traditionally taught or what you may think. All RSI users would benefit from this chapter’s content.