Thanks for taking the time to share your reflections. Good luck on your journey and keep going. The first steps are the hardest in the journey to become a developer, and you seem to have flown past them!
Hi Tùng. To make the article simpler I did not make use of ‘equal height’. But using ‘equal height’ and ‘equal width’ together would give a better user experience by making sure the content anchor to the top and bottom, as well as the sides. I hope this helps!