For those doing business in Second Life the Currency Exchange is a tool that can improve their profit margin when they are taking L$ out of world to RL currencies. One just has to understand how it works, which is what this Second Life Currency Exchange Tutorial is about.
If you are a resident that just needs a few Linden dollars on occasional bases to purchase something, you can still gain from understanding how the Currency Exchange works and knowing what it is and how to use it. You won’t need some of the more esoteric information I’ll provide. Knowing the basics will save you a few L$.
The Exchange

XStreetSL has a Currency Exchange, which is now owned by Linden Lab. This is a place where you can easily buy and sell L$ as well as other stuff. It is a fun place to shop also and has loads of free stuff. There is no StreetSL fee for moving funds between SL and PayPal. Using PayPal is the only way to take cash out of XStreetSL. URL: https://www.xstreetsl.com/