I attended to self-published tech book event in Tokyo, last Sunday. There were 6,000 people in this event.
We wrote a book to run WordPress on Google cloud platform with @takahashifumiki. We had 100 copies for our book and all of copies are sold out!
My part is about the Google app engine.
Actually, it was first time to use GCP for me, so I had to repeat creating/destroying projects on GCP for many times.
But I had a chance to send PRs to Google and all of my PRs are merged.
It was great opportunity for me. 🙂