While there are quite a few resources online, often they are focused either on community project code that is constantly changing or disjointed in such a manner that it is very difficult for you to find a coherent learning path.
Just a few months back, in June, the early access program for Effective Business Process Management with JBoss BPM kicked off. This book is focused on a coherent path of learning to get you started with BPM and it focuses on JBoss BPM Suite as the Open Source BPM solution of choice.
The first chapters have been put online and you can both read along as the book is written, while interacting with the author in the online forums.
Effective Business Process Management with JBoss BPM, so head on over and grab yourself a copy using the code dotd081716au to get started with JBoss BPM Suite.
The deal will go live at Midnight US ET and will stay active for ~48 hours, running a little longer than a day to account for time zone differences.
If you would like to help out with socializing this news, here is a tweet you can cut and paste into your social networks:
Deal of the Day Aug 17th: Effective Business Process Management with JBoss BPM by @ericschabell. Code dotd081716au http://bit.ly/2bhTySE