Learning yaml. which python yaml library is used in homeassistant?

Configuration
1

Is there a best starting point to learn yaml? I want to make sure that the version and library that I am using is the correct one. I am running python 3.7 on macOS 10.15.2 catalina

2

Home Assistant uses YAML 1.2 now, with the ruamel library.

For using YAML with Home Assistant, see the docs.

3

Yaml is yaml…