Check out example codes for "mysql allow remote connections". It will help you in understanding the concepts better.

Code Example 1

#open /etc/mysql/mysql.conf.d/mysqld.cnf 
#and change
#bind-address            = 127.0.0.1
#to
#bind-address            = 0.0.0.0

#then grant root all privaleges to root
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
FLUSH PRIVILEGES;

#If you ran above command and accidently
#did not change password for root you can run this:
ALTER USER 'root'@'%' IDENTIFIED BY 'MyNewPass';

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