First HTML/CSS project ever

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

I wrote this code computer screen first. I had to completely rewrite the code to make it responsive with phone screen sizes(needed a lot of help to figure this out). I will start coding phone screen first and work my way out.

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

Getting the image to cover 100% of the top of the page when sizing screen below 470px. Doing this gave me a understanding of how I think and write my code from start to finish.

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

Anything and everything. I want to learn the best ways to write code.