How To Create a New User and Grant Permissions in MySQL
How to Create a New User
MySQL is an open source database management software that helps users store, organize, and later retrieve data. It has a variety of options to grant specific users nuanced permissions within the tables and databases—this tutorial will give a short overview of a few of the many options.
Open your shell, login with root account mysql then type
CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';
Sadly, at this point newuser has no permissions to do anything with the databases. In fact, if newuser even tries to login (with the password, password), they will not be able to reach the MySQL shell.
Notes : for create database you can use
create database [databasename];
then grant user to database with this command
GRANT ALL PRIVILEGES ON [databasename].* TO 'newuser'@'localhost';