Programming is difficult. Learning is difficult. Programming in experimental technologies while learning entirely new concepts is especially difficult. If you completed the tutorial in this book--or even only certain sections of it--you should be proud of the accomplishment.
I sincerely hope what you learned here will be useful for you in your careers. This book has been an exciting journey for me as well. When I started, I was excited about the world of Progressive Web Apps, but by no means an expert. Now, having dived deep into the progressive web, I'm more excited than ever about the possibilities. I hope you share the same feeling.
If you ever want to get in touch, I would love to hear from you--feedback, criticism, questions, or simply conversation. You can find me on Twitter with the handle @scottdomes, on LinkedIn, on Medium as @scottdomes again, or on...