PM up-skilling.
You are going from beginner to 0 because as a PM you are never 100% on your learnings. There is always something new to learn and improve on.
Note that I think repetition is the best way for the mind to remember and stick to things. It is important that you are going through these things over and over and over for them to become subconscious.
Product thinking
The first principle thinking-
Superhuman as a case study for product thinking-
Understanding communication
Communication basics-
Hypothesis creation
Types of hypothesis-
How to draft a good hypothesis-
User research
User research basics-
User research methods-
Product discovery
Product discovery basics-
How to conduct product discovery-
Analytics
Analytics basics-
A/B testing
A/B test beginnings
https://productcraft.com/perspectives/product-management-101-a-b-testing/
https://productschool.com/blog/product-management-2/product-management-skills-a-b-testing/#:~:text=A%2FB testing involves splitting, two versions of a feature

Going through the content (claps).
Thought I should add a link to Arielle Jackson's article from Rahul's video https://review.firstround.com/Positioning-Your-Startup-is-Vital-Heres-How-to-Do-It-Right.
She basically talks about a framework to explain your product in plain English.