I'll be Honest - I Don't really use this method.
BUT, in saying that, I've seen some campaigns that clearly have, and they've sold 1,000s.
With Teespring, there's a variety of designs and angles you can come up with, tracking trends seems to work for people but you have to get it at the RIGHT moment. When it's hot.
Reddit basically puts out the hottest news topics in front of you in a way you can do some heavy research into it and give it a shot.
Go through the below video to see how I'd go about this method.
You might want to also read through some comments to obviously see what the discussion is about, what opinion is strong and what the touchy points are.
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