Installing FTP on a RaspberryPi
Often when working with a RaspberryPi its handy to be able to quickly transfer files via a gui In this guide I'll be using a windows client and a RaspberryPi B running Jessie however I believe all versions of Pi are supported.
From the Pi
take ownership of the www folder
sudo chown -R pi /var/www
install vsftp Very Secure FTP Daemon
sudo apt get-install vsftpd
edit the config files
sudo nano /etc/vsftpd.conf
add this to the end
sudo service vsftpd restart
From a Windows client
Download and install FileZilla. Its a wizard, just hit next a few times. Once installed and opened, you'll see a screen like below. The Pi's IP username and password go here. Hit quick connect and it will log in with an FTP session to the Pi.
I've also found the visual representation of file permissions handy. Helped me out a few times.