iForgeIron.com
iForgeIron
A long-running blacksmithing forum and knowledge base with sections on forges, anvils, tools, techniques and heat treating, plus member-written lessons and blueprints. Good for searching years of practitioner answers to specific problems and asking experienced smiths about your setup.
More resources on Blacksmithing
r/Blacksmith
A large Reddit community where hobbyist and professional smiths post forge setups, finished pieces and work-in-progress questions. Useful for getting critique on your own work, troubleshooting forges and heat treatment, and seeing how experienced smiths approach common projects.
ABANA.org
The Artist-Blacksmith's Association of North America, the main nonprofit for the craft in the US and Canada. Its site lists affiliate chapters, conferences and classes, and publishes educational material, making it the place to find local groups and in-person instruction.