Can a product section show products from just one category or brand?

Yes. Open the product section and go to the Content tab:

1. Set Filter By to Categories.
2. In Include Categories, pick Footwear (you can pick more than one).
3. Optionally set Source, for example New arrivals — newest first, and a Number of products.
4. Click Save.

For a brand, set Filter By to Brands and use Include Brands. Tags works the same way with Include Tags. Each one also has an Exclude list, to show everything except your picks.

Only the dimension chosen in Filter By counts. Products picked earlier under another option are ignored. New products you add to that category show up by themselves.