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You can @ anyone you want in the body of your text, some people do a mailing list kind of thing. But, I've seen people get annoyed for being randomly tagged in posts.

The 10 tags at the top should be used to tag different communities to do with the post. Like scholarandscribe or creativecoin, for creative fiction.

If you look at peoples posts you'll discover other tags, certain tags can earn extra tokens which is cool for stacking up some more coin.

You'll get the hang of it the more time you spend on Hive. There are also Discord servers you can join if you ever need to ask questions