How Can Salesforce Trailhead Help in Building and Scaling an Ecommerce App?

I’d like to start a discussion on how learning through Salesforce Trailhead can support professionals who are working on or planning to build an ecommerce app.

Specifically:

• Which Trailhead modules are most useful for ecommerce app integrations (CRM, customer data, automation, analytics)?
• How can Salesforce tools improve customer personalization and retention in ecommerce apps?
• Has anyone used Salesforce Commerce Cloud alongside a mobile ecommerce app?
• What’s the best learning path on Trailhead for developers or admins focused on ecommerce solutions?

Would love to hear real experiences, recommended modules, and practical insights from those who have applied Salesforce knowledge to ecommerce app projects.