For XPages developers, IBM recommends both this forum (the one you're using now) and Stack Overflow.
You can use this forum itself, the Notes/Domino XPages development forum, for discussion. You're already in the right place if this fits what you want to do.
For specific questions, use Stack Overflow. Please use the tag xpages so that other XPages developers can easily find your questions.
In other words, Stack Overflow can be used for practical, answerable questions based on actual problems that you face. For general discussion and larger questions please continue to use this XPages forum.