1.Using Intents:

Start an activity by creating an Intent and passing data through Intent extras (using putExtra() methods). The launched activity can retrieve the data using getIntent() and get the extras.
You can also use startActivityForResult() to start an activity and receive a result back from it.

2.Using Bundles:

Bundles are used to pass data between activities using the putExtras() method of an Intent. The receiving activity can retrieve the data using getIntent().getExtras().

3.Using Parcelable or Serializable:

Implement the Parcelable or Serializable interfaces in your custom class to make it serializable. Then you can put instances of the class directly in the Intent extras or Bundle to pass them between activities.

4.Using a Shared ViewModel:

Create a ViewModel instance and share it between multiple activities. The activities can observe changes in the ViewModel to communicate and share data.

5.Using a Singleton or Application class:

Create a Singleton class or extend the Application class to store and share data globally across activities.

6.Using Local Broadcasts:

Send broadcasts using the LocalBroadcastManager class and register BroadcastReceivers in activities to listen for and receive those broadcast