It’s not easy, but it’s more approachable than many realize.

Much of modern operating systems are the hordes and hordes of drivers; the fundamentals aren’t terribly complicated; just lots of detail.

take a look at AtheOS it's successor SyllableOS. created by a single developer, another single developer took it over (syllable) and it shortly became an open source project before it went defunct again. But it made impressive gains in the 3 years of initial development.

i miss those days of everyone and their mom creating an OS for giggles

CP/M was also created by one person.

You will be blown away by Serenity OS then.

Ever heard of TempleOS?

It’s the only OS endorsed by God.