Exercise 3: Showing a Product Grid Without the Block Editor — Possible Solution
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THE RIGHT MECHANISM: THE [products] SHORTCODE
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Per this chapter, the [products] shortcode is exactly built for this
case - typed directly into a page (in a Classic-style paragraph or a
Shortcode block) with attributes controlling how many products to
show, how many columns, and which category to pull from, for example:

  [products limit="4" columns="4" category="hoodies"]

This matches the store owner's stated requirement precisely: a grid
of 4 products from a specific category, without needing to use the
Block Editor's own visual tools.

THE EQUIVALENT BLOCK EDITOR APPROACH
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Per this chapter, the current, actively-developed equivalent is the
WooCommerce "Products" block - a native Gutenberg block configured
visually through the block editor's own sidebar, rather than through
shortcode attribute syntax, matching the same product-grid
functionality.

WHY THIS WORKS AS AN ANSWER
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It correctly names the shortcode mechanism (including its relevant
attributes) as the fitting choice given the stated constraint of
avoiding the Block Editor, and correctly names the Products block as
its modern equivalent when the Block Editor is being used instead.