TensorFlow and C api

I have installed the TensorFlow C Api and I have manage to run the hello world example without any problem.
Then I have started to look the tutorials and I did not find the equivalent in the C api.
For example in this tutorial (TensorFlow 2 quickstart for beginners  |  TensorFlow Core) they use keras but I don’t see how use this library in the C api.

Is there any tutorial or example for the C api?