A review of 4 different product owner assessments you can use to determine areas where you can focus your learning efforts and find just-in-time resources.
Product Ownership
What's the best way to interact with your delivery team?
Product Mastery – Traits of a great product owner
A summary of Product Mastery: From Good to Great Product Ownership by Geoff Watts. The book describes the traits of great product owners: they are DRIVEN.
13 Examples of Internal Products
13 episodes from the This is Product Management podcast and the 100 PM podcast where the interviewee works in what I’d consider an internal product context.