Wrote and published a book on how to implement Sign in with Apple (https://siwa.fluffy.es https://siwa.fluffy.es) as I am an iOS dev and also backend dev, plus

Wrote and published a book on how to implement Sign in with Apple (https://siwa.fluffy.es https://siwa.fluffy.es) as I am an iOS dev and also backend dev, plus the deadline Apple set for it is end of this month. Didn't do much marketing but still managed to sell 15+ copies, pretty happy about this attempt, spent 3 weeks writing it after work hours.