Find biggest folder and biggest files
Find 10 biggest folder and files in current folder
du -a . | sort -nr | head
Find 25 biggest files
find . -type f -exec ls -al {} \; | sort -nr -k5 | head -n 25
Other ideas are here: https://superuser.com/questions/276487/how-to-find-the-largest-directories-or-largest-files