If you would like to know which tags to use, for different topics, why not click on a few different tags - and just pick the top 10 trending posts, on that tag ; then look at each of the tags that they use, and which topics they bring up in their current post .
That is probably the best advice i could give at this moment .
Usually one topic can also be bunched into another, like Music, or Poetry, can also be used in Art, because of the nature of both topics are artistic .
I could also suggest researching into Freelance Writing ; it is very useful in the long run, if you intend to make some noise on any kind of writing platform .