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The Discord part of the trails is more like background discussion and curation. The trails themselves are on Steemit. Just like any person's account, you can follow the @gardening-trail or the @foraging-trail, or any of the others. So you will see posts by a lot of people on each trail, but the posts are focused on a specific topic.

Yep, I noticed that. Okay! Can one create his own? Does the owner of @gardening-trail etc go out on steemit to seek posts to resteem or the posters use hashtags? I saw a lot of resteemed posts. If I wanted to make a trail, I would like an inspiration-trail

Here's some information, @surpassinggoogle -- Steem Trail Daily. Go to the section "What to Do" and see how to join Discord. Then you can see what trails are there, that you might be interested in. And you may be able to get a new trail developed by connecting with the SteemTrail people named in that section. Good luck!