Ask HN: Best resources on becoming a better mentor?

I'd like to become a better mentor, not just from a technical perspective but also for career and even financial or life advice. I have a reasonably long career history and have risen to a level in my company that's pretty well respected. A lot of people come to me for questions that I'm able to answer, but I can't help but feel that I could be providing more to people who are looking to up-level their careers.

Are there any resources that have helped you become a better mentor, such as blogs or books?