Thanks, but that’s not quite what I need, because it means I need to type a password whenever I want to read the post (annoying for me), and that others can see that the post exists and read the title. I’d rather other users couldn’t even tell that the post exists.
I’ve discovered that, for posts, there’s a “Post Status” that can be either Published, Draft or Private. Is there any way to have a Private (not password protected) page?