I am working in Nextjs framework,I was reading about "server side rendering" and "client side rendering", so we should use CSR(client side rendering) if we have "large amount of dynamic data" on the other hand we should SSR(server side rendering) if we have "less amount of dynamic data", so i want to know that

1. If we have "large amount of dynamic data" so there should always use "server side props" ?
2. There must be "getStaticProps" for "build time" and "getServerSideProps" "run time" ? if yes then
3. Can we use "getstaticProps" and "getServerSideProps" in "CSR",in other words let suppose i have "large amount of data" so i decided to use "CSR" but i have to "fetch data of multiple users" so in this case what is right way ?