If you organize your styles using OOCSS or BEM, you will find them easy to reuse; that is why we need to apply multiple classes to the same HTML elements.
This exercise is part of a more complete interactive series for anyone interested in learning CSS; you can find the whole series here:
https://breatheco.de/interactive-exer...
On this page of the site you can watch the video online 04.2 - How to apply multiple CSS classes to the same HTML element with a duration of hours minute second in good quality, which was uploaded by the user 4Geeks Academy 13 December 2020, share the link with friends and acquaintances, this video has already been watched 9,006 times on youtube and it was liked by 65 viewers. Enjoy your viewing!