You could use Matrixify to export all URLs slugs and check them. Yes looks u got spaces in URLs, but on the product URL page in backend Shopify you should be able to change the URL slug.

Not sure either, I'd look closer in the page code.

We've been using Google Search Console and other external tools, but nothing beats having direct access to server logs for tracking Ads and SEO performance.

Same here, Atomic Habits book was great!