React | Sass Calculator App - Tried to build it with TypeScript

Hello!

I build it very quickly, had no problem with styling or structure. JS logic wasn't too hard as well. I know I have to improve some bugs, but that is not the case.

I recently started to learn TypeScript. I made up my way through Max Schwarzmuller's course on Udemy, but this course is a mess for me rn, just theory, nothing besides. So I decided to make this app and give TS a try.

First of all - I can't see advantages of using it. I know that maybe this app is too small for seeing power of TS, but please tell me. What should I do to learn it? I need practical knowledge, not theory. I know what Types are, Generics, Decorators and so on... but where can I learn it by practice? I wish FreeCodeCamp had section with challenges about it.

BTW I had to change tsx files into jsx because I coudn't deploy it for some reason. I tried to compile tsx files into dist/.jsx but nothing worked. So another red flag for TS. I don't want to discriminate this language, because I really want to learn it, but for now it is masochism for me.

Do you have any tips or sources of knowledge for me? I need some projects to build with TypeScript. Anything.

Thank you ❤