Where can I get good online courses on DevOps?

DevOps is not a profession, but the approach and tools. A unified approach - automate everything. But the instrumentation is extensive, so a single course can not find.

To start moving in the direction of work using these approaches:

• you need at least to be able to write (popularly now bash+python, ruby will be useful) and to read other people's code
  
• learn and try at least one tool for each of DevOps practices
  

Linux Administrator get !
sql
python

DevOps is a movement and/or methodology. Neither be you will not succeed.

School of DevOps go. Well they teach. They have free courses with teachers there.
\rhttps://devops-school.ru

As the above said profession, but there are engineers that use DevOps practices.
I'm in this profession came from system administration, having a pretty good background and now am inclined to think that this is not a profession you want to start from scratch. Now trying to develop internal courses for their employer, to attract into the profession ops engineers or developers. At first I thought that it is possible to give the material to June, but eventually came to the conclusion that first you need to work in development\\administration to the level of the middle and to have an idea about how systems work, how they are developed and exploited in parallel, you can explore DevOps tools.
Courses will be advised to only basic courses, any what you like on topics: Linux, Python, Docker, Kubernetes, Jenkins, Git.

For example there are a DevOps RoadMap

I think devops be just for practice