Category queries are won by collection pages, and most Shopify collections are a heading, a filter
Category queries are collection-page queries, but most Shopify collections contain no text and cannot compete for them.
Filtered and sorted URLs multiply into thin near-duplicate pages that consume crawl budget without ranking.
Auto-generated collections built on tags proliferate silently, and stores routinely have far more than anyone realises.
Collection content should answer selection questions, not repeat product detail, or it competes with your own product pages.
The commercially important ones should. A query like "waterproof hiking boots" is a category query, and the page that should win it is a collection.
The full guide has the formats, the deadlines and the worked examples.