Flexbox became much easier for me once I had some experience with tools like QT Designer and GTK's Glade. Those tools force you to understand the mechanics and

Flexbox became much easier for me once I had some experience with tools like QT Designer and GTK's Glade. Those tools force you to understand the mechanics and elements that drive responsive GUIs more or less immediately. Once I came back to styling with CSS, I immediately understood how to use flex and develop slick UIs with it.