Where to insert a custom item in /etc/hosts file?
You can add it anywhere you want in the body of the file.

Additionally the following works also:

127.0.0.1   localhost website.dev website.org


and for me even this works (but I don't think it's recommended):

127.0.0.1   localhost, website.dev, website.org


For the sake of a better overview I prefer:

127.0.0.1   localhost
127.0.0.1   website.dev
127.0.0.1   website.org
255.255.255.255 broadcasthost
...IPv6 stuff...