Mortgage Repayment Calculator with React.js

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

I am really proud I managed to finish this project. Learning about managing state on form inputs was awesome.

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

I encountered some issues with TS as I expected I would and I managed to solve them by asking AI to explain what the errors actually meant, also I went over the docs too. I also had problems with handling focus states with onFocus and onBlur event handlers, better said I didn't even know that was possible.

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

There are some improvements I could make like making inputs into a reusable component but I honestly didn't feel the need to do in this kind of a project. I would like someone to look over my code and tell me if it's decent on first sight?