This lesson teaches how to create a customizable search bar for different screen sizes. The video shows creating a search bar using a frame, icons from the Phosphor pack, and custom styling. The lesson covers setting the search bar's width, height, and divider and arranging it within the page layout. It also explains how to turn the search bar into a component and customize its behavior on tablets and mobile devices. The final outcome is a stylish and functional search feature that blends well with the website's design.