Your first category
You will get real records into your workspace and then look at them through a view you shaped yourself. By the end you have a working category with something in it. This assumes you have a workspace open, from Your first hour.
Start from what you have
If you followed Your first hour, you have already done the quick version of this. You typed a few things into the capture box on the dashboard, Cobblr worked out what they were, and it built the category around them, fields and all. That category is what the rest of this path uses, so keep it and skip ahead to Add a record.
Starting from a blank workspace instead? The dashboard opens on the same question rather than a settings screen: add your first thing and let Cobblr work out the rest, start from a ready-made bundle, or open More ways to start and browse the whole catalog. Any of the three lands you in the same place, a category you can add to.
If you would rather switch a whole module on by hand, open Configuration → Modules, in the Build section, and enable Inventory. That gives you a parts list to work in for the rest of the path.
Add a record
Open your list and hit New Part (the button carries whatever your list calls its items, so a Yarn list reads New Yarn). Give it a name and fill a couple of fields (a quantity, a location if you have one yet). Save it. That is one record entered by hand. Later tutorials add faster ways in, but the form is always there.
See it in a view
The record you just added is data; a view is a lens on it. Open the list's view and switch between the table and the gallery to see the same record laid out two ways.
Now make one of your own. Add a filter (for example, quantity below some number) and save it as its own view. You have just made a "what's low" list that updates itself as your data changes. Views are cheap, so make ones that match how you actually look for things.
You now have
A live category with a record in it and a saved view over it. Next, get things in faster by scanning them instead of typing.