Udemy is a great place to learn. I would like to recommend some intro courses to AWS, Jenkins and Kubernetes – which are free of charge:

1. Kubernetes: https://www.udemy.com/kubernetes-from-a-devops-kubernetes-guru/learn/v4/overview
2. AWS: https://www.udemy.com/aws-essentials/learn/v4/overview
3. Jenkins: https://www.udemy.com/jenkins-quick-start/learn/v4/overview