how to start a activity in kotlin code example

Example 1: start new activity kotlin

val intent = Intent(this, NextActivity::class.java)
// To pass any data to next activity
intent.putExtra("keyIdentifier", value)
// start your next activity
startActivity(intent)

Example 2: how to start activity from fragment in kotlin

activity?.let{
    val intent = Intent (it, Main::class.java)
    it.startActivity(intent)
}