Grandmaster Marc Olsen is sharing secrets while playing live on http://www.backgammongalaxy.com.
Marc's newest book for beginners and intermediates:
How to Not Suck at Backgammon - https://shop.backgammongalaxy.com/products/how-not-to-suck-at-backgammon-by-marc-olsen-for-beginners-intermediate-players-softcover
Play and learn by playing on Backgammongalaxy.com or download the app BG Galaxy in app store.