How was the renaissance was a cultural shift?

As with the Ancient Greeks and Romans (from whom the Renaissance took so much inspiration), a conquering army could bring not only a regime change but also acultural overhaul. ... Italy in the 14th century was fertile ground for a culturalrevolution. hope it helps

The printing press created an almost insatiable demand for new reading materials. This demand induced writers across Europe to produce literary works of every conceivable kind. In keeping with the times, they wrote in their native languages, such as French or Italian, instead of medieval Latin. Literature now became more widely accessible across Europe. Suddenly, readers could enjoy such revolutionary works as Dante's "Divine Comedy" and Cervantes' "Don Quixote." The Renaissance also saw the flowering of English literature, most notably in the person of William Shakespeare.