You could pay for our Performance Based Navigation course (you would get it thrown in with a type rating if you did it with us) or you can work through the link I gave above. I would also suggest reading the ICAO PBN doc if you can get hold of it. It's boring but it's got everything you need to know in there.
Some simple stuff that might help:
An RNP specification includes a requirement for on-board self-contained performance monitoring and alerting. RNAV does not.
There are no RNAV final approaches in the new specifications they are either RNP APRCH or RNP AR APRCH.
RNAV arrivals will not go beyond the FAF.
There is an anomaly in that RNP 10 will not be re-named. It is however not an RNP specification it is RNAV (no monitoring and alerting required). They decided not to re-name it simply on cost grounds!
RNP:
RNP 4 For oceanic and remote continental navigation application
RNP 2 Basic-RNP 1, Advanced-RNP 1, RNP APCH, RNP AR APCH For various phases of flight. (advanced RNP 1doesn't exist yet).
RNP with additional requirements
TBD (eg 3D, 4D)
RNAV:
RNAV 10 (RNP 10) For oceanic and remote continental navigation applications
RNAV 5, RNAV 2, RNAV1 For en-route and terminal navigation applications
In the past, the United States and member States of the European Civil Aviation Conference (ECAC) used regional RNAV specifications with different designators.
The ECAC applications (P-RNAV and B-RNAV) will continue to be used only within those States.
Over time, ECAC RNAV applications will migrate towards the international navigation specifications of RNAV 1 and RNAV 5.
The United States migrated from the USRNAV Types A and B to the RNAV 1 specification in March 2007.