Hiera is a key concept, when we are looking to segregate data from our code and let it remain clean. This is an introductory video and would help to build a concept around it.
6.1 Puppet Hiera, Puppet Hiera Introduction
Do gave a read at the documentation (which is having more detailed explanation than video link) we written around this video at https://learningtechnix.wordpress.com/2022/02/18/puppet-understanding-hiera-1/
