I have been out of the Teradata world for around a year now. I never really found a good Teradata community like we have here for SQL Server. I think the Teradata site has their own forums, but I don't think the user community is as robust as we are here on SSC. I'd search for a random Teradata question on Google and see what results it brings back. Some of those results should be for Teradata forums. I'd recommend joining the ones that look legit and posting your real question there. There's still a chance someone here may post some useful answers, but you should seek out Teradata specific experts as well.