mysql give full permission to user code example

Example 1: mysql grant all privileges to user from any host

GRANT ALL PRIVILEGES ON database_name. * TO 'username'@'localhost';

Example 2: mysql user permission database

GRANT ALL PRIVILEGES ON `db_name`.* TO 'user'@'host'

Example 3: how to add privilege in mysql user

CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';