Custom Roles & Permissions - Getting Started

Custom Roles and Permissions control who can do what across the account or within specific teams, for organisations needing more flexibility than the standard roles. Questions this answers: How do I get Custom Roles & Permissions enabled for our account? Can I give someone access to reports without full admin rights? What happens to existing Team Admins and Team Leads when CRP is enabled? Can I create a role that lets people author content without being an admin? Can I limit a team admin's permissions to their own team?