How did Tahawwur Rana help David Headley identify key 26/11 targets in Mumbai?

Tahawwur Hussain Rana, the Pakistani-origin Canadian national and key accused in the 26/11 terror attacks on Mumbai, has revealed some crucial details about the operation to authorities. Rana was extradited to India from the United States in April after the US Supreme Court dismissed his review petition. But what did Rana say? How did he help plan the attacks?

Explainers