A command that I use a lot to see the space occupied by files and directories is the "du" command.
By setting some parameters it is very convenient to use:
du -sm * | sort -nr | head -5
Head -5 is to return only the first 5 results, you can change it to for example 10 if you want to see more results.
sort -nr is for sorting from heaviest to lightest. So if we use it together with "head -5" we get the 5 things that weigh more.