A local privilege is a privilege than can be exercised only in a container in which it is granted. Depending only on the way it is granted, a privilege becomes common or local. When you grant privilege locally (in the current container), it becomes a local privilege. Both common and local users or roles can have local privileges.
For this recipe, you'll need an existing user (c##maja) who can grant some privileges (for example, create procedure, create table, create view, and create synonym) and roles (c##role1, c##role2, c##role3, c##role4, and local_role1) in a specific container (root or PDB; in our case, pdb1) to existing users and roles (c##john, mike, local_role1, c##role1, c##role3, and c##role4).