Unlike every other Website feature above, a blog post isn't something a visitor sends you, it's content you write yourself, through your project's own Blog manager in the editor.
Drafts vs. published posts
A new post starts as a draft, visible only to you. Publishing it makes it immediately reachable on your live site, both as its own page and listed by a Blog List block wherever you place one.
What a post can contain
A title, an excerpt, an optional cover image, and a rich text body (headings, formatting, images, and links), written directly in the manager's own editor.
Tip: Renaming a post's URL slug after it's already been shared changes its address, anyone with the old link sees a 404 instead. Keep a slug once real visitors have started using it.