Course on coding a SaaS from scratch?

I build software development courses (coderrocketfuel.com) and am currently working on a course that will provide a step-by-step guide on coding and deploying a SaaS from scratch.

Below are some details about the course.

Service: Website Uptime Monitoring Business (i.e. pingr.io or UptimeRobot)

Features:

• Build landing pages centered around creating conversions.
• Sign-up new users to a free trial using a credit card. $5/month is charged after the free trial ends.
• Login and authenticate existing users.
• Allow users to add up to 20 website URLs to monitor.
• Send email and/or text-message alerts to users if their website goes down.
• Handle customer's canceled credit cards and chargebacks.

Tech stack:

Frontend: Next.js (React.js)
Backend: Node.js
Database: MongoDB
Payment processing: Stripe
Hosting: DigitalOcean

The goal is to provide a solid foundation for building any type of SaaS.

As an indie hacker, what else would you want to see in this type of course?

What other things would help someone learn how to build a Saas?