Ripple documentation required?

Some of your questions can be answered with this link:
1. https://ripple.com/files/ripple_solutions_guide.pdf
2. https://ripple.com/ or https://ripple.com/insights/
3. https://ripple.com/xrp/buy-xrp/
4. https://coincheckup.com/coins/ripple

Ripple problem : https://bitcoinist.com/3-problems-ripple-investors-cant-ignore/
Ripple has a problem about decentralization, https://hackernoon.com/4-alarming-reasons-ripple-might-not-be-what-you-think-9debc3c86985

 I hope this helps.