I picked up How To Raise An Adult by Julie Lythcott-Haims as I'm interested in the culture of over-parenting, why we are where we are and what can be done about it. While I wouldn't consider myself a "free-range" parent, I'm interested and open to that type of parenting and being thoughtful about raising kids so they can be competent adults.
There were some good nuggets and takeaways in this book. Parents with older kids might find this more helpful but overall this book for me was a reminder to give my kids age appropriate opportunities to step up to the plate and do things independently as much as possible, (even if that means losing some control and perfection in the process).
Literacy is a prerequisite for freedom. Read deeply. Read what matters. Build a reading list. Don't take literacy for granted.