Start with the thing most guides get wrong: schema markup will not move you up the rankings. Google has said this repeatedly and the evidence supports it. Adding Product schema to a page sitting at position 30 does not move it to position 10.
What it does do is decide how you appear once you rank — price and availability under a product result, a star rating, a breadcrumb trail instead of a raw URL. And increasingly it decides how confidently a machine can state a fact about you, which matters for AI answers where there's no ranking to compete for at all.
So the honest framing: schema is an appearance and comprehension lever, not a ranking lever. Worth doing, not worth expecting miracles from.
The Shopify-specific problem is different from the one most merchants expect. It usually isn't that you have no markup. It's that you have it twice, and the two copies disagree.
Your theme ships some Product schema. Your reviews app injects its own, complete with a rating. A third app adds an Offer. Now one page carries two Product entities with different prices, or a rating that doesn't match what's displayed. Nothing visibly breaks. No error appears in your admin. It just quietly degrades how much Google trusts your markup.
That's why the first job is auditing what you already have, not adding more.




