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is there a guide to making interesting Treads to get a merit?
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You've already answered yourself -
make an interesting Thread and you'll probably get a merit
You'll find dozens of guides how to get merit - but they tell you only: write good looking, well written (good speling and gramar), interesting/helpful/meaningful posts.
And that's enough - it's all you have to know - rest is up to you.
Just think about the topic what could be useful or interesting for others - no one tell you what should it be because
it could be ANYTHING - story from your own life, guide for creating crypto wallet or protecting from hackers, some stats research, simply everything!!!
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If I am in my local forum there are some treads that are made into a discussion if a tread made is good and interesting it will get a merit. Is it here?
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You can "hunt for merits" both in local board or main ones. From my own experiences it's easier to get them on main boards (English spoken) but it depends on local community and its merit activity.... for example 17 - 20% of all merits were given on Russian local threads...