re:Work - Guide: Develop and support managers
From the site:
"These course materials were originally designed for Google managers to help them transition from individual contributor roles to manager roles. In addition to building skills, the curriculum incorporates introspection, perspective shifting, and awareness building. This product has been influenced by years of iteration, internal and external research, and feedback from new managers. This version has been modified to make it as useful as possible for an external audience. Adapt it to fit your organization’s culture and needs."