If you are a PhD supervisor or other PGR student supervisor you can find information and guidance on supervision at the Doctoral College site, linked below
Training, tips and advice for people that manage research staff.
I know from personal experience as a researcher and as a manager of research that the right environment, including culture and opportunities for personal development can make all the difference to the experience and the future choices of researchers.
Online toolkits and resources covering common aspects of management, for you to engage with at your own pace.
Training courses you may want to consider enrolling on focused on leadership and management.