Must have free resources for Product Managers
Product managers need to read a lot. Reading gives you better context for your decisions. It also helps you argue for your idea and sell it.
If you read only one book on product management, read four steps to an epiphany. If you don’t the money to buy this book read this free PDF:
Steve Blank has posted many videos on youtube to help you learn skills like:
How to interview customers
How not to interview customers
How to find customers BEFORE building a product
etc
Here are the next set of free resources for Product Managers
Good product Manager / Bad Product Manager https://www.khoslaventures.com/wp-content/uploads/Good_Product_Manager_Bad_Product_Manager_KV.pdf
What does google look for in a Product Manager https://www.youtube.com/watch?v=ntzB9pGsD3E
Good product strategy : https://medium.com/@melissaperri/what-is-good-product-strategy-8d5587cb7429
Sachin Rekhi on art of Product Management: https://www.youtube.com/watch?v=huTSPanUlQM
If you read only one book on negotiation, read Getting More by Dr. Stuart Diamond
Here are the free blogs to follow on product mangement
Foundation with Kevin Rose including interviews with Ben Horowitz, Elon Musk, Om Malik, etc
There are so many skills a PM needs to master including digital marketing, especially if you work in a small company where you do both product and customer acquisition. I love: