How can I transfer files and folders between my METU user account and my computer by using SSH SFTP?
WinSCP is the one of the FTP programs you can use. You can make operations like changing the permissions of your files in the server, copying/moving a files and folders.
Additionally, for users who are more comfortable with command line PuTTY is a free software which enable to make necessary operations.
https://winscp.net/eng/download.php address can be used to download these two programs.