Ask HN: How to move into product management

i am a developer and while i am excited about the coding/designing side of sw development, product management seems to be some kind of black art to me. i don't understand how to product managers zero in on a new product to be developed? where should i start? what are some good reference books for this field ? also has anyone transitioned from programming to product mangement? if yes please share pros/cons and how did u accomplished it.

Thanks in advance