Yup you have to be extremely careful with links. Entering a link and then doing some action, for example doing a half-linebreak (SHIFT+ENTER; don't know the exact name) bricks the editor. The forum software is… very good like that. Just put all links in at the end, and always copy your post before submitting (or even type is out in notepad or something). Great times!

That's a good summary. Tutorials and articles should be thought about, written, rewritten, tested, verified by someone else, rewritten again based on that, reviewed again, and finally copied over then touched up for the site.

If you're writing it for the first time in the editor, chances are it won't be great content. The site's editor isn't that great and has been through many revisions over the years. It has some good functionality, but also issues.