Interview Prep Site that provides a slack channel on top of the usual suspects which are video courses, questions database and peer mock interviews.
[FEE]Site provides a great way to practice for that big tech product manager interview, complete with a great list of product design, insight and strategy questions.
[FEE]Site that provides a set of resources to ace that big tech PM interview
Michael Porter
Michael Porter's Five Forces Analysis is a method for analyzing competition of a business. While first published in 1929 in Harvard Business Review it still is a classic in strategy.
Parth Detroja
Authored by 3 Product Managers at Facebook, Google, and Microsoft, and based on interviews with 67 product leads, Product Management’s Sacred Seven is a comprehensive resource that will teach you the must-know knowledge and applied skills necessary to become a world-class PM that can get hired anywhere.