Source: web.dev
Mobile
Compliments to Apple’s tutorial. Creating and Combining Views.

Another point goes to web (in my book) vs apps. The e-book explores today’s mobile web experiences and why PWAs provide revolutionary solutions to improving UX on the mobile web.
By awwwards.com
Eight fluid interfaces, the design theory behind them, and the code to build them
A bunch of real world examples and explanation of creating a Priority+ Navigation for mobile
Find out what “thumb zone” actually means and why it’s such an important factor in the design and development of mobile interfaces today.
Build SMS & VoIP applications via a web API using the standard web languages you already know. Free trial available.
By Twilio – APIs for Text Messaging, VoIP & Voice in the Cloud