It can be both and a lot more to be honest. You can post simply to your blog where only your followers will see the posts in their following feed, for example my following feed is: https://peakd.com/@acidyo/feed, so that's where I see all posts of the people I follow. However there are also communities similar to subreddits, that's where I'd recommend new users to post into for a chance at better visibility and curation as users subscribed to for instance @worldmappin as you mentioned will check for posts specifically for travel so their community feed looks like this: https://peakd.com/c/hive-163772/created

this also allows people to check their community feeds, a feed where posts appear from only the communities they're subscribed to: https://peakd.com/created/my

then we also have something new similar to short form content like twitter called snaps, on the blockchain level they're just comments in a daily post, but the front-end shows them separately so people can use that to try and attract others to their posts or share more random things that don't necessarily need a lot of vote rewards: https://peakd.com/snaps/snaps/newest

but yeah, communities are definitely the best way to start posting and engaging in, connect with authors you enjoy the content of, leave them some comments and many may reciprocate the activity and come to your posts in the future as well!