Each version of MySQL adds new features to the database and some old features, and queries will be either removed or deprecated. So when you connect an application, it is important to determine the current MySQL version to make sure that your application is compatible with the database.
Wine is an implementation of Windows APIs that used to run Windows software directly within Ubuntu Linux. Winetricks and PlayOnLinux are third party applications run top of the wine to making it easy for the user to install Windows softwares.
WordPress has bugs and security holes just like any other content management system. When developers find those issues, they release updates to the WordPress core, themes and plugins. And it is your responsibility to apply those updates regularly to keep your website/blog secure and up to date.
This tutorial explains how to allow remote connections to the MySQL/MariaDB server on Ubuntu 18.04. The default behaviour of the Ubuntu MySQL Server blocks all remote connections. Which prevent us from accessing the database server from the outside.
This tutorial explains how to reset MariaDB root password in Ubuntu server 18.04 bionic beaver.
MariaDB server on Ubuntu does not need a password for connecting as a root user because the server-side plugin named unix_socket is used to authenticate clients which are connected from the local host using the Unix socket file.