I took this course by Venkat Rao and Sarah Perry and it is really great:

 https://ribbonfarm.teachable.com/p/the-art-of-longform

This podcast series on the Jordan Harbinger Show with Alex Kouts is so useful I would have paid to listen to it:

https://www.jordanharbinger.com/alex-kouts-the-secrets-about-negotiation-part-one/