Responsive Product list with cart using ReactJs

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

I am proud of the fact that i created this using ReactJs, a framework i am not very familiar with. Next time, i would like to write short, more effective code.

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

I had many challenges and was able to overcome all except one.

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

I have an area i need help with which is when a button is clicked to add a product to the cart, all my buttons show and all the products are added. I tried every means i knew and could get but it still didn't work.