Reference:
https://github.com/nomisRev/AndroidCleanMVP
Awesome tutorial for Dagger: https://www.youtube.com/watch?v=SKFB8u0-VA0
Must read for Retrofit Cache https://futurestud.io/tutorials/retrofit-2-activate-response-caching-etag-last-modified
Android Clean MVP https://github.com/nomisRev/AndroidCleanMVP
Must Read below podcast: http://fragmentedpodcast.com/episodes/105/
Some useful tips - Kotlin: https://medium.com/grand-parade/6-magic-sugars-that-can-make-your-kotlin-codebase-happier-part-1-ceee3c2bc9d3 https://medium.com/grand-parade/6-magic-sugars-that-can-make-your-kotlin-codebase-happier-part-2-843bf096fa45
Architectural Components: https://www.youtube.com/watch?v=Ts-uxYiBEQ8
At the last: Something about security: https://proandroiddev.com/secure-data-in-android-encrypting-large-data-dda256a55b36