Our most important ritual, regardless of whether we are working in Scrum or Kanban, is the daily standup to ensure that everybody is aligned with the highest priorities of the day, to identify any problems or obstacles that need to be remediated, and to clarify any ambiguities or misunderstandings. The second most important ritual would be the retrospective, where we look back on our performance, seek opportunities to improve, share knowledge among the team, and create actionable intelligence.