A Kanban board should make pipeline health understandable at a glance. Keep stages tied to meaningful progress and avoid creating a column for every small task.
Keep card context actionable
Ownership, customer, value, next activity, and recent context are more useful than a crowded card. Notes and detailed history can stay in the lead record while the board remains scannable.
Move cards because reality changed
A stage move should describe a real change in the sales process. That produces cleaner history and more trustworthy reporting.