Informal workplace learning is an essential part of lifelong learning. In recent years, digital technology has come to play an increasingly important role in enabling informal learning at work through various tools and resources. However, as little empirical research exists on informal learning in this context, more knowledge of digital work practices that promote informal workplace learning is needed. This paper describes a digital ethnography that was conducted to investigate informal learning in authentic work settings. The data were collected from a public sector workplace during the years 2020-2022 and included observations, interviews, and participant diaries, which were analysed using qualitative ethnographic content analysis. This study draws on practice theories to further understand digital work practices and how they are formed in people's daily activities and interactions in the social and material environments of digital technology and work. We present our findings in terms of five practice categories -- work-related communication, relational communication, sharing, following and listening, and controlling the use of digital technology -- to illustrate how informal learning takes place in everyday work. The detailed accounts of these practices contribute to understanding how digital technology can be used to foster informal learning in work.