If you forget your (MariaDB) root password then you can reset MySQL (MariaDB) root password
As first stop MySQL MariaDB, then start Mysql in safe modus without grant-tables
systemctl stop mariadb
mysqld_safe --skip-grant-tables &
Now login as root but without password, then update your mysql root password with a new password
mysql -u root
use mysql;
update user SET PASSWORD=PASSWORD("newpassword") WHERE USER='root';
flush privileges;
\q
and restart MariaDB
systemctl restart mariadb
now you can try to login using your new mysql root password
mysql -u root -p
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