If you're just starting out your product management career you might find these resources useful. They played a large part in helping me learn the skills of the job.
ESCAPING THE BUILD TRAP
Book by Melissa Perri
Melissa takes an organisation wide view of how product management can have the biggest impact. It helped me figure out where my blind spots where as I transitioned from individual contributor to product leader.
Through examples, it paints a clear picture of what a product lead organisation can look like.
Training for Product Managers and Marketeers
Formerly known as Pragmatic Marketing, the Pragmatic Institute provides classroom training wildly recognised in the industry. I did the Foundations, Build and Focus modules after about 2 years on the job. I still use their templates, particularly the positioning document.
Free Product Management Unconference
Unconferences are events during which any of the attendees can present or propose a topic for discussion. You just have to turn up on the day and add yourself to the schedule, or just attend the sessions. It's a great place to practice your public speaking and learn from your peers.