Disclaimer: I'm the head of product for a company that sells a solution in this space, CloudZero: we're a cloud cost intelligence platform that helps other companies organize their spending on AWS and other public clouds, going down to unit economics.
The FinOps book is a decent starting resource if you haven't read that - they do a good job, in my opinion, of distilling the basic nomenclature here.
From another perspective, AWS's Mike Rosenberg was a great thought leader in this space; he had a number of blogs in this space that I thought did a good job of enablement, such as:
https://aws.amazon.com/blogs/aws-cloud-financial-management/what-is-a-unit-metric/
Happy to talk more about my experience as well (either point you to writings from my company or chat more,) but am new here, so I wasn't as sure what community guidelines are for recommending a company you work for!