This paper will explore the experiences of the #Openteach project team in developing a flexible and evidence based approach to support professional learning for those who teach online. The project had a number of phases, which included a needs analysis of online students and educators about effective online teaching, the publication of a review of the literature entitled Teaching Online is Different, and a pilot evaluation report. The #Openteach open course ran in March 2020 and focused on five key aspects of teaching online: social presence; facilitating discussion; collaboration online; live online teaching; and supporting online students. The final phase of the project involves the creation of an open textbook bringing together all of the project outputs, due for publication in summer 2021. Drawing on qualitative and quantitative data collected from online educators pre and post the initiative, this paper reports on two aspects of the #Openteach project in detail: the design, development and delivery of the open online course and the process of creating the #Openteach open textbook.