Create a new entry in Joomla. Where does it live? Does it even exist other than in the db table? Is it a page? No. Is it a blog entry? Maybe, if the system is set up that way. What kind of entry is it? Try explaining the difference to a non-technical user.
Choose the category you want. Oh, you need a new section. Forget about making a menu link to the entry and create a new section, then a new category. At this point it's actually easier to delete the original entry and post it again.
Now create a menu item. Which menu? If the site is complicated at all that's a legitimate question. Once you've created the menu item, then go back and find the created entry and attach it to the menu item. Okay, your new page is live. Whew.
The system is certainly flexible when it comes to creating a complex site, but for small sites and non-technical users it's both confusing and a lot of work.
Now you need to change something on one of the pages. Is it a component? Maybe it's a article. Oh, it's a module. No... Give up and call the IT guy.