In case you wonder FileZilla is one of the most popular FTP clients out there. It has a nice list of shortcut keys that you can use to master it.
F2 – Rename selected file
F3 – Search remote files
F5 – Refreshes local and remote file and folder views
Tab – Switches to the next view
Alt+Down – Transfers the currently selected item to an item of the same name in the other pane
Alt+Up – Navigates up one line in a tree view (same as Up Arrow), navigates to parent folder in file view
Ctrl+C – Stops the current operation
Ctrl+D – Disconnects from server
Ctrl+E – Show files currently being edited
Ctrl+M – Manual transfer
Ctrl+O – Enable directory comparison
Ctrl+P – Process queue
Ctrl+Q – Exit
Ctrl+R – Reconnects to server
Ctrl+S – Opens the Site Manager
Ctrl+T – Opens a new tab
Ctrl+U – Preserve timestamps of transferred files
Ctrl+Y – Toggle synchronized browsing
Enter – Transfers the currently selected item if it is a file or expands it if it is a directory
Ctrl+Page Up/Page Down – switches to next/previous tab Up Arrow – Moves up one item in the current view
Dn Arrow – Moves down one item in the current view
Left Arrow – Nothing in a files view, Up one level in a tree view
Right Arrow – Down one level in a tree view, if there are subfolders, nothing if there are none. Pressing once expands a collapsed node. Pressing again steps down into it.