Locate the MySQL Database in your file system
/Library/Application Support/appsolute/MAMP PRO/db/mysql57
Certificate problems under macOS
MAMP_PRO_Root_CA is not trusted, find it in the
Keychain Access app and "Always trust" it there.
Activate command line shortcuts for the selected PHP version, pear, pecl et al. and
also activate shortcut for Composer. After that you can use the command
composer from the terminal.