Changelog of updates
It would be nice to have a changelog page, of what's new and updated in the book over time. I see it's updated often but I don't know where to look to see what's changed. Email notifications could also be nice. If you have some version history like from git, GPT could summarize the diffs to automate the work
MAKE Dark Mode
I'm really enjoying reading the book right now. I usually read in the evening, but the light mode is pretty uncomfortable. A dark mode function would be great :)
"No money/investment" section doesn't truly represent a "no money" situation
Written from the perspective of someone who has too much money (and also has probably never pirated anything). "A simple web server is $5/m" No, Vercel is free. "A code editor like Sublime Text is $80" VSCode is free (and probably much better/extensible). "To make iOS apps, XCode is free. A developer license with Apple is $100/year" Apple ecosystem is for people with money. Go for web/Windows first, Android later, Apple last. The only think I can think of you might actually have to pay for here is a domain name, and incorporation.