Menciona un proyecto que hayas hecho y porque hiciste lo que hiciste

Q. which css framework you used for making website and why? Q what is react and how it's different from other js frameworks ? Q write a function to find frequency of repeated number in array? Q write a function to to find shortest string length in given string ? Q write a function to merge two in one array and sort it ? Q what is virtaul dom and how it;swork ? Q question related to promises and async and await? Q some settimeout and promises question which run first?