For a homework of Odoo course:
How can I make a report that shows the credit limit for country of the customers in Odoo13 that shows the information in a tree view (list view) and a graphic view?
Is it possible to do it using Customized Views ("Technical>User Interface>Customized views") or I need to install a new Odoo App to make it?
Like you saied Technical>User Interface>Customized views you juste need to create a new view that read from your module and add it to your module's menu with new action and in action type you put tree , pivot,graph