Unlike websites, which are largely commoditized by big players, custom apps still fetch large sums. The pros in this space charge project-based (or at least per diem) rates, so you'll need to be good at estimating your work.
Of course, you should do a great job, dedicate regular time to learning, and explore things that interest you. These maxims are probably true for success in many other careers.
I suppose that charts like this could be useful to find new things to learn? But you certainly don't need to know all of this to get a job. Trying to tick every box on a learning list like this amounts to procrastinating the real tasks of finding work and writing code.
For those who haven't read it, the book is essentially about how computers work, from first principles up to integrated circuits and high-level programming languages. What makes the book special is the excellent writing: it has an engaging, conversational style, and is accessible to a non-technical audience.
If he's taking more time for himself (and hopefully, to write more books, as indicated in the post), that's awesome.
It started with only live streams (24/7 youtube music channels)
I enjoy lofi youtube mixes when coding, and theres a lot of them.
Currently im adding functionality for users to curate the mixes
I think its cool bc its kind of like a shared youtube playlist for a particular niche, with nice ui, and soon with curation