Notes:

The Aboriginal Dreamtime, or The Dreaming, is a rather hard thing to explain. So much that you're getting two links for this one to try and help out.

Essentially, it is the beginning of everything, where all life was created and all knowledge was taught. However, it never ended; essentially meaning that the beginning lasts forever and never ends. Hence why it's sometime referred to as the Everywhen.

In the lore, all living things were either the ancestors themselves, or were made by the ancestors. That is, a river may be an ancestor and may also be a creation snake.

The Dreaming explains how things came to be – why a rock is in a certain place or a particular shape, why the echidna has spikes, why the moon returns full every month, how kangaroos got their tails.

The Dreaming also commands the rules and ways of being in Aboriginal culture.

The individual exists in the Dreamtime before they are born, becoming the guardians of the land of where they are born and then returning to their place in the Dreaming upon death.

It does not matter if the person was good or evil in life in terms of what happens to them in the afterlife. There is no Heaven, nor Hell. Only The Dreaming.

A more in-depth look into the Aboriginal Afterlife can be found here.