Bibliography
If you want to read about Terrence Malick, here you go:
Books
If you read only one book on the subject, it should be Martin Woessner’s Terrence Malick and the Examined Life. It’s better than all the other books about Malick put together. I reviewed it here.
The Magic Hours: The Films and Hidden Life of Terrence Malick, by John Bleasdale. The only full biography so far. I’m not crazy about it: it’s not insightful, and it gets some facts wrong, but overall it’s very thorough. More of a chronicle than a story.
All Things Shining: An Oral History of the Films of Terrence Malick, ed. Paul Maher Jr. Essentially a compilation of every major interview ever given by anyone associated with Malick, including some interviews with Malick himself.
A Critical Companion to Terrence Malick, edited by Joshua Sikora. Many good (though often quite academic) essays.
Essays and articles
You can learn a lot by searching for “Terrence Malick” at criterion.com
The Yale Review | Bilge Ebiri: “Why Terrence Malick Is the Most Influential Director in Hollywood
Terrence Malick, the Way He Was | The New Yorker
Hollywood Bigfoot: Terrence Malick and the 20-Year Hiatus That Wasn’t | Los Angeles Review of Books
‘Days of Heaven’: On Earth as It Is in Heaven | Current | The Criterion Collection
‘The New World’: Terrence Malick’s Magic Portrayal of America’s Original Sin • Cinephilia & Beyond
Let There Be Light: ‘The Thin Red Line’
21st-Century Cinema in Review: ‘The Tree of Life’ - The Ringer
Also
Thomas Flight’s video essays on Malick are excellent.