Wow. If you don't really use the CSS display: flex property (flexbox) then this is an excellent FREE course for you to review. If you use flexbox all the time, then it's still an excellent course for you.
Wes Bos dives right in and gets to the heart of how flexbox works with practical examples and live code samples. His videos really help you to gain a deep understanding of how you can use flexbox in your everyday work.