Blogs https://randsinrepose.com/ https://blog.pragmaticengineer.com/ https://www.theengineeringmanager.com/ https://www.askamanager.org/ https://increment.com/ https://devtomanager.com/
Conference https://theleaddeveloper.com/
Other Resources http://lenareinhard.com/engineering-management-reads/ https://github.com/LappleApple/awesome-leading-and-managing
Previously: Best book / resources on leadership, especially for tech teams? https://news.ycombinator.com/item?id=21712194