Responsive four card feature section

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

Did some research and found out that the main axis changes when you use the flex direction of column. this will help in positioning flex items in the flexbox

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

I was not sure on what breakpoints to use, i couldn't get all four cards to shrink and grow evenly, any suggestion will be appreciated

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

I think my flexbox is getting better, what do you think?