People sometimes ask various versions of the question: “How do I start using ProseMirror on my website?”, and the answer is usually something along the lines of ProseMirror not really being such a product, but rather a library for building such products.
As a result, I would like to draw your attention to ProseArea, a simple JavaScript bit for complete newbies to transparently replace textareas with ProseMirror instances. It doesn’t implement everything ProseMirror is capable of, but may prove useful for those who are just looking for a WYSIWYG/Markdown editor: