4 card feature section with flexbox and grid

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

• proud of solve the challenge

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

• positioning the layouts to look good

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

• which breakpoint should I choose if there is no tablet layout design?
• Finally I used 768 breakpoint, because cards look ok and can grow to 1440, but I tried 1200 breakpoint it seems ok too.
• should I let to the cards grow to specific point or set max-width?

Feedback welcome ;)