Hi @sagarsuri
I’ve visited this website for many years, if I’m not wrong the main focus of this website always have been iOS development and technologies that will help you to improve or complement your iOS development
https://www.raywenderlich.com/3159-what-s-this-blog-about
But through the pass of years this website have been evolving in design, user experience and content like the new branches of Android & Kotlin, Unity and Server Side Swift tutorials
https://www.raywenderlich.com/6721-welcome-to-the-new-raywenderlich-com
Suggest your topics to the raywenderlich team so they can consider those for a future book or tutorial
hope it helps