Room -> Replace annotationProcessor with kapt

apply plugin: 'kotlin-kapt'

Thread{}.start() -> thread {

}

Storage in android :
  -> SD Card, Internal, External

ADB Idea plugin (to clear cache real fast) -> Menu : CTRL + Shift + A

Device File Explorer -> View device files on android studio

Passing object in shared preferance -> Serializable, Parcable.

Important stuff -> Serializable and Parcable and their difference