Note: Currently working on updates for v1.8.
For support, please visit the support service on the platform you're following the course on (Udemy or VPP). I generally check every day.
Now available at VirtualPairProgrammers.com and Udemy!
The link here has a coupon code which is valid until 9th November 2019: https://www.udemy.com/course/istio-hands-on-for-kubernetes/?couponCode=6082122CC64DA306A8AB
Aim: make Istio understandable - it's not that hard. I don't mention TCP/IP stack levels once. Or the CNCF.
There will be further material added later [I'm working on this, but in slower time!]