Poison Dart Frogs and Vivariums: A good facebook group with many hobbyists and dart frog breeders, admins are real good and look out for the community.
South west froggers group: Another good facebook group if your on the west coast and looking for locals… before covid they used to have meetings in the Phoenix area.
Dendroboard: The oldest dart frog forum still around and it feels like it. Tons of good info here if your willing to work for it.
Dart den: A good dart frog forum that has been around since 2004 and is still well maintained.