What are you doing right now?
You can answer a question like that in a zillion ways. Whatever your answer is, write it down.
On the next line, write “Before that…” and write down what you did before that.
You can write short things or long things, one word or a whole page. You can skip back one nanosecond in time, or 3,000 years. If you skip back to the Big Bang and describe what happened before that, nobody can say you got it wrong. Continue…