This Power group is good. However there are some other communities which may be more focused on IBM i. Some examples include:
SQL: https://community.ibm.com/community/user/power/communities/community-home?communitykey=3fcb1d91-6b8b-42a1-aa05-26e106041399
IBM i Access Client Solutions: https://community.ibm.com/community/user/power/communities/community-home?CommunityKey=4c4a4639-c7b2-4cad-9ede-0184ed3abd9f
IBM i Global (general questions about IBM i): https://community.ibm.com/community/user/power/communities/community-home?CommunityKey=f0246bc4-08f3-43c5-a7f8-b6a64d387894
For more communities, such as Navigator, Rational, etc, check out: https://community.ibm.com/community/user/power/communities/ibmi-home