Responsive E commerce product page

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

I am proud of my first intermediate challenge. I struggled a lot with making the website responsive. I hope to keep in mind both desktop and mobile designs while writing HTML to make sure it is easier to apply media query later.

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

Making it responsive was a challenge, and I had to revise my html about 2 times to make it possible. I took a good look at both desktop and mobile designs to get an idea of how the HTML should be written.

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

I wrote this code in 2 days, so please comment on my speed and do provide me valuable advice which would help me make my next project more efficiently and in a more professional way. Any piece of advice given would be greatly appreciated.