Responding page with flex, and grid design

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

Usually, I'm better at writing programs that decorate web pages than I do with logic or functionality. This time, I feel like I've done more than enough in terms of logic, and I'm glad I've made some progress.

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

function to change number to format number like 100000 idk how i can change form number to format number i have no idea util i founded Intl.NumberFormat() It has helped me a lot. In this change

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

I would like some advice about writing. Logic because I feel like I'm not very good at it. Please help give me some advice. TQ.