Databases
Create MariaDB, PostgreSQL, and Valkey databases, open them in phpMyAdmin or Adminer without a password, dump and restore them, manage PostgreSQL extensions, and use the temporary key-value store for caches, sessions, and queues.
SQLite databases
A SQLite database is one file, with no server and no credentials. Why it isn't on the Databases page, how to open one in Adminer from the file manager, and how the panel recognizes one.
Runtimes & Tools
The language runtimes and command-line tools installed on the server, how to run a specific version, how to change PHP settings, and how to install Perl modules into your home directory.
PHP
How to choose a PHP version per directory, where the command line gets its version from, and how to change PHP settings without a php.ini editor.