Cloud Native Learning Platforms

"KataCoda" was an early solution for "running docker shell from web browser".

recently the free version was removed ("blockchain mining abuses?"),
it is now only available with O'Reilly Learning subscription.

 Leveraging Katacoda Technology - O'Reilly Media

but there are some good alternatives available 

List of Hands-On Cloud Native Learning Platforms

• A Cloud Guru
• AppSecEngineer
• Cloud Academy
• Cloudyuga
• CodeCrafters
• Developer Sandbox for Red Hat OpenShift
• Instruqt
• Katacoda
• Killer.sh
• KodeKloud
• KubeAcademy
• O’Reilly Interactive
• Play with Docker
• Play with Kubernetes
• Pluralsight

Top 5 Free Resources to Learn Docker | LinkedIn

KataCoda Alternatives and Similar Sites / Apps | AlternativeTo

Instruqt: App Reviews, Features, Pricing & Download | AlternativeTo

Killercoda: App Reviews, Features, Pricing & Download | AlternativeTo

DevOps Online Training Courses | KodeKloud

Killercoda Interactive Environments