I am pretty new to Trello and am experimenting with copying boards and lists. I want to use a board with predefined lists and cards to which a user can add cards but can not modify list headings or some cards the admin has created. Is there a way of locking parts of the board ?
With Trello, permissions are board specific. At this time, Trello is not able to offer card specific permissions. This is a feature request that has been received, so hopefully this can be implemented in the near future. For the time being, you'll need to have separate boards for privacy.