Install Frappe LMS Subdomain

I have a fresh DigitalOcean droplet that will be running Ubuntu and I want the open-source Frappe LMS deployed on a subdomain of my main site. The task covers the full setup: provisioning any required packages, installing the latest stable Frappe LMS release with its standard database configuration, pointing the subdomain, and making sure everything is reachable over HTTPS.

Please secure the stack (firewall, fail2ban or equivalent), enable daily database backups, and leave me with concise hand-over notes so I can maintain and update the instance myself. Once the installation passes a quick walk-through of creating a course and enrolling a test user without errors, the job is done.