phpMyAdmin is a popular tool for administrating MySQL (and similar) databases
PMA is best known as a GUI for managing not only the data within a mysql database, but the table structures as well. Because mariadb and other MySQL forks are similar enough they can also be administrated with this tool.
phpMyAdmin is a free software tool written in PHP, intended to handle the administration of MySQL over the Web. phpMyAdmin supports a wide range of operations on MySQL and MariaDB. Frequently used operations (managing databases, tables, columns, relations, indexes, users, permissions, etc) can be performed via the user interface, while you still have the ability to directly execute any SQL statement.
Questions about this tool should be focused on the problems with setting it up and not using it to manage the database.