Basically you have to follow the hot trends which are identifiable in terms of tags. It ensures that your post is visible to a max audience who take interest. This, in turn, increases sharing, commenting, viewership and voting for your post. This is how you earn money there.
Now I've seen a lot of people who know far better about tags than anyone else. But the thing is, they can't write an engaging content. Flooding up an article with keywords just to get ranking, will certainly get you there but you won't earn for long since the audience would never appreciate if your language is not human friendly.
Cutting the long story short, add as much value for your audience as possible. Know what they're looking for. Determine the tone they seek, etc.
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