multiple names for same directory

How do you create a directory that has more than one name and/or location? For example, on cPanel based webhosts, when you login to FTP, you will usually see public_html and www…. No matter which one you open, you go to the same place and see the same exact files.

How could I do something like that and create multiple directory names for the same directory? Also, how would I order linux to automatically create these directory names in someone's home directory upon account creation?