Knowledge
Infrastructure DBA skills
Get practical skills of how to deploy, extend, maintain and support Postgres installations and 3rd-party Postgres ecosystem software.
Skillsets

Skyeng PostgreSQL DBA
by Artem Naumenko (slack2)
Materials
If you know useful resource, that helps to get this skill, please, spare a minute and add the link
Question
Questions are very useful when trying to understand if you know the subject
Do you know that ...?
Any useful or interesting facts about the skill. Any peace of information would be useful