Doorways in the Sand – Roger Zelasny, 1976. I read the first section in Analog, the June 1975 issue, which was I think the first SF magazine I ever bought. The idea of being a perpetual student like the protagonist grabbed me then–and I’m living it now!
It’s Not About the Tights: An Owner’s Manual for Bravery – Chris Brogan, 2015. Great title, disappointing book.