We use version control to store stuff. What stuff? A bunch of items, the most basic elements of TFVC. In everyday parlance, an item is a file or a folder. TFS rarely makes a distinction between files and folders; they are stored as rows in the same table. But implementation details aren't the point. In our model we will almost always talk about items because files and folders behave so similarly.
(in other words, anticipate lots of posts about version control that never say anything about files. weird, eh? that's how I rationalized writing 2 long intro posts)
Ok, so items are important. What are they?
Those are the important points for today. As an addendum, let's think through the consequences of having folders be first-class items.
Next time: more on names.