This is going to look really complicated, but it's really nothing you can't handle. It has a bit of inline javascript to get the "update" and "remove" buttons working.

The only 3 important things to pay attention to is the

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What kind of themes are accepted?

Only a small percentage of submitted themes are published. Beautiful aesthetic and a unique layout are key ingredients to ensuring your theme gets accepted. Design quality should be on par with shops featured on our examples page.

The majority of submissions are rejected because it does not meet the Theme Review Team's design standards. It's difficult to articulate a subjective design opinion and Shopify cannot give in-depth feedback on your aesthetics.