Mobile first solution using FlexBox technique

Hi guys!

This is my first solution for the newbie challenge, and I've already learned so much from it. I would have a few questions.

Can you please check the structure of the HTML code? Do you think is there a better way to organize the tags?

Another question regarding the CSS code, I am not sure if am doing correctly the responsive part of the code. Can you check if I am using the correct breakpoints? Which one is recommended to use the min-width or the max width?

Thanks in advance! Can't wait to do the next challenge and step ahead!!