Doubt. Tags: misunderstood or bugged?

darwen(47)
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10y

Someone can explain me how we must use #tags when posting? I mean tags you add in the box when posting.

As i read in the tag box, i can add more and more tags, and reading some guides i've understood that first tag gives the #category to my post.
But i've noticed that sometimes some tags dissapear, and other times my first tag isn't my topic category.

Thanks for your support in advance.

Doubt. Tags: misunderstood or bugged? | Ecency