I googled.
I asked in forums but I could not find any forum, newsgroup or discussion boards for "trainers" (teachers, coachers) and supporters (writers of courses, sysadmins of labs, et al) of professional courses for IT developers
Might be the certified by major vendors trainers have the sites with forums but they are closed to non-certified "colleagues". Are there? I even do not know!
I train as a hobby, sporadically, and I am not certified as trainer, at least by private entity. I daresay I spend on preparation to train more than I earn from training
Any advise on "free" (open to genral public) forums for teaching developers?