Ramit Sethi is "the new finance guru" (Fortune), "a unique voice on money, one singularly attuned to . . . his generation" (San Francisco Chronicle). He reaches over 500,000 followers a month on his website, iwillteachyoutoberich.com. And his book, I Will Teach You to Be Rich, is a New York Times bestseller with 383,000 copies in print-and the kind of backlist title that is so robust that its sales increase year after year. Now on the eve of its tenth anniversary comes a significant...