I see only Home and posts from people I follow.
To find people to follow and/or tags to follow - user want to see posts from other people this user not following.
Also, some remark about this Explore-feature to cohost.org help section, is it planned to be implemented or no.
In the meantime, when you search for tags, or click on tags people (or you yourself) have used , you can see posts from everyone - whether you're following them or not - so it's a good way to find people you're interested in following. You can also find people as they're shared by people you're following.