There is another valuable resource that I would like to recommend to you:
The Google CSS Education Hub is a helpful platform for Google CSS. It provides relevant training materials on Google Shopping and CSS, and you can also take regular and advanced CSS certifications there.
In order to gain full access to the Education Hub, you will need to fill out this form. After submitting the form, you will receive an email from css-nda-request@google.com to complete the registration process.
Based on experience, there are sometimes delays with Google processing registrations. Therefore, I kindly ask you to reach out to me directly if you haven’t received any feedback from Google two weeks after submitting your application.
I hope that the CSS Education Hub will help you take your Google Shopping knowledge to the next level.