Magento 2 Launch Checklist

Here's a checklist that you need to follow before taking your store live:

1. System Requirements
2. Latest Version
3. Prepare HTML Head
4. Shipping Methods
5. Payment Methods
6. Taxes
7. Cron (Scheduled Tasks)
8. Correct Store Information
9. Change Admin URL and Secure Passwords
10. Clear Test Data
11. Enable Varnish Cache
12. Javascript and CSS Optimization
13. Images Optimization
14. Email Templates
15. CMS Pages
16. 404 Error Page For Your Magento Store
17. Analytics Google

To learn about the implementation of this checklist, here's a full guide: Magento 2 Launch Checklist