In this lesson we take a look at, Learn CSS Flexbox by Building a Photo Gallery, freeCodeCamp Guide for Beginners, CSS Course. This is a course based on the freeCodeCamp section, Responsive Web Design. If you are looking into Web Development and you are a beginner. This is the course for you! Here we learn that Flexbox allows us to design our webpage so that it may look good on any size screen. This is a huge responsive web design feature and is key to becoming a pro developer. Throughout this Flexbox guide we use Flexbox to build a responsive photo webpage gallery.