You can think of community as a Topic
If you register (subscribe) the community of the topic you are interested in, the articles of that community will be registered in “My communities”
Handy way to curate and view community posts

Communities are located on the right side after you logged in
You can see trending communities
-Each community often holds events

If you click a community
You can subscribe or post directly to that community

If you want to find another community, click 'Explore communities…' on the left side

If there is not a community that you want, you can create one.
Click ‘Create a Community’

As a community representative, a key generated for you.
Keep it to a safe place and click ‘Create Community’

Depending on which tag is used, the degree of exposure of the article,
registration in the community, participation in the event, etc is affected
Tags allow you to register your article to multiple communities with a single post.
You can add up to 8 tags on Steemit.

#kr : KR community
#kr-newbie : People who started steemit often use this tag. Please use this tag for people with reputation below 50
#kr-success : Free Voting for Koreans