Contents tagged with content part
You might want to have a content part hidden: that is, you not only don't want users to be able to attach it to content types but you don't even want user to see - and thus know about - it. This is the case if the part is something very technical or if it's only interesting for a single content type.
Make sure you don't forget anything if you develop a content part. Here's a high-level checklist you can run through so you don't forget anything: