Permission to users to edit or delete tasks and documents exist?

Permission to users to edit or delete tasks and documents exist?

Permission to users to edit or delete tasks and documents exist? I saw a post on the forum about 2 months ago, where you say that the implementation of permissions has not been done in Zoho. The concern always falls on customers or external collaborators, because although there is a notification of change of tasks, it is necessary to restrict updates only for project managers. There is provision for release permissions, that is to say, it is something that you learn to develop in the future? I can even say that it as basic is crucial to the project - Security! I look forward to returning and, thanks in advance.