But things like HTTPS, payment processing, emails / account management and even game programming, all of these have already been made easier - nobody has to build any of that on their own anymore, at best they have to configure it.
To make a safe website, stop wanting to do everything yourself. Use a webhost that doesn't give you SSH access, or a service like Netlify.
And linking all these heterogeneous pieces together and configure them to work is like cat herding: each component is so different and the developers are so proud of their "innovative" way of doing things that one cannot master it. A few years ago I started to believe that modern web developers are more about showing off and hipstering than having a genuine desire to make things better.
I just checked the author’s website, and he could have just used an installer to get him a wordpress website with an elearning system plugin attached to get to the same result. Buy an SSL and he would have been done. Any other path is just making it harder if it is not his field of expertise.
To make a safe website, stop wanting to do everything yourself. Use a webhost that doesn't give you SSH access, or a service like Netlify.