I need angular help how to use simple classes and interfaces?

Question

Angular

I have a class file with fields where I use it everywhere, but I realized that it’s not right and I need to somehow deprive it and implement it in each module / component where I use it (as I understand it in the shared folder) but I don’t understand how to do it, create classes folder where I will put classes... or leave as is... or something else
example class
file name
numbers