PHP 7.3+ , alongside with the pdo-mysql, gd, curl and mbstring extensions.
The recommended requirements are:
MySQL 5.7/MariaDB 10.1/Percona 5.7
PHP 7.2, alongside with the imap, pdo-mysql, gd, curl and mbstring extensions.
An SSL certificate and configuration for the (subdomain) you intend to use. You can use Free let's encrypt ssl certificate