I'm amused, that sometimes when you begin starting to learn something, you see resources for learning everywhere. (And I just learned it's called Fequency Illusion or baader-meinhof-phenomenon [0])

Thank you so much for publishing this book for free, I'm eager to dive in! Is there any chance you can also link it as ePub?

[0]: https://en.wikipedia.org/wiki/Frequency_illusion