Responsive QR website using grid css

What are you most proud of, and what would you do differently next time?

I learned to make my code simpler, to look at my CSS better and search or read it and understand that some things are unnecessary or repetitive, to use grid better.

I feel that this page or website will help me a lot to improve my skills with CSS and HTML to make my structures more semantic and simple.

What challenges did you encounter, and how did you overcome them?

A challenge I found would be to use CSS as best as possible, understand it better, search and investigate which is the best option to use and try to make everything as semantic as possible! Sorry if I still have errors, thanks to those who help me.

What specific areas of your project would you like help with?

I would like to receive help in any way possible, whether my code is good (CSS, HTML), whether my designs are good and how I could improve all of this with your help.