start fragment from activity kotlin code example

Example 1: start fragment from activity

FragmentManager manager = getFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.container,YOUR_FRAGMENT_NAME,YOUR_FRAGMENT_STRING_TAG);
transaction.addToBackStack(null);
transaction.commit();

Example 2: how to start activity from fragment in kotlin

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