How to get started with network automation

Hello.

The evolving of networking ask us to learn network programming.

In my case i did the python for networking course from David Bombal and im actually following is course on Ansible for network.

Now i have some basics on Python for doing basics task on gns3 labs.

But actually how to really getting start on Network programming?

I mean networking programming is not only using python modules and ansible.... There is the SDN stuff, controllers, API... How to getting start with those stuff? I heard construtor go their own stuff