Linux operating system. Other operating systems should work problems but haven't been tested.
HTTP Server, NGINX is recommended, Apache HTTPd should work without problems but hasn't been tested.
PHP, version >= 7
apcu extension (
mbstring extension (if not available, use libonig)
If you're going to use databases (Database module)
MariaDB Server, MySQL also supported
pdo_mysql and mysqli PHP extensions
If you're going to use advanced cache
If you're going to use Image manipulation (Image class)
gd PHP extension
If you're going to connect to external sources like APIs