Frontend Mentor - ExpenseChart component solution(Angular 14)

What did you find difficult while building the project? What I found difficult was implementing the charts I found that it was hard to create one using only html and css and had to result in using a library. Which areas of your code are you unsure of? When fetching the data from json file was I supposed to use observables or just fetching them directly. Do you have any questions about best practices? Which is the best way to fetch json data from a file.