Where do you learn/read about leading product designers better?

Product Designer Playbook - This is one of the best guides I have seen. This originated from Pivotal Labs, their product design and development practice was honed through 20+ years of weekly retrospectives. I suggest archiving a copy of it.

https://www.vmware.com/docs/design-guide-tanzu-labs

I also suggest downloading a copy of the Product Manager playbook. https://www.vmware.com/docs/vmware-tanzu-labs-product-manage...