Based on an overview of the existing literature, this paper aims to provide a holistic and coherent conceptualisation and understanding of the complexity of educators' professional learning. First, the way in which professional development, professional learning and everyday learning have been configured in contemporary research is combined with an initial practice theory perspective. Consequently, we conceptualise professional learning as learning in and for professional practice. Subsequently, the theory of practice architectures, a practice theory developed in educational settings, is presented. Based on the authors' previous work, aspects of relatings, that is, the social space in which educators relate to each other in the mediums of power and solidarity, are highlighted. These include power, trust, recognition and agency. The paper ends by presenting a framework for understanding the complexity of learning in and for professional practice, consisting of two complementary perspectives: a site-based and time-bounded focus on professional action and an open-ended process of educators' professional and human growth. Brought together these perspectives enable an understanding of the complexity of professional learning in terms of praxis development.