Flipping a classroom means giving students content like lectures to learn on their own, typically through videos, and doing activities and problem-solving in class with teacher guidance. It aims to make students more responsible for their learning and engage them with technology. Not every lesson needs to be completely flipped; teachers can flip parts of lessons. While it requires more initial effort from teachers to prepare videos, it saves class time otherwise spent on lectures. The document provides several free digital tools and resources teachers can use to create and implement flipped content.