Explore how to extend Sketch 3 to improve your workflow and create content more efficiently in this comprehensive video tutorial. Learn to use plugins for effortless placeholder images, easy content generation, and annotations with Sketch Measure. Discover better distribution techniques using Sketch Distributor and improved pasting functionality. Dive into CSS layouts, including Flexbox for automatic layouts and layout prototypes. Master dynamic artboard mirroring and realistic device mockups with Magic Mirror. Implement easy dynamic padding with Modulizer and create automatic adaptive layouts using constraints. Finally, explore the integration of icon fonts in Sketch to enhance your design process and productivity.