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-f      Requests ssh to go to background just before command execution.
This is useful if ssh is going to ask for passwords or passphrases, but the 
user wants it in the background. This implies -n.  The recommended way to 
start X11 programs at a remote site is with something like ssh -f host xterm.
If the ExitOnForwardFailure configuration option is set to “yes”, then a client 
started with -f will wait for all remote port forwards to be success‐fully 
established before placing itself in the background.

-g      Allows remote hosts to connect to local forwarded ports.

-R [bind_address:]port:host:hostport
Specifies that the given port on the remote (server) host is to be forwarded 
to the given host and port on the local side.  This works by allocating a socket 
to listen to port on the remote side, and whenever a connection is made to this 
port, the connection is forwarded over the secure channel, and a connection is 
made to host port hostport from the local machine.
Port forwardings can also be specified in the configuration file.  Privileged 
ports can be forwarded only when logging in as root on the remote machine.  IPv6 
addresses can be specified by enclosing the address in square braces.
By default, the listening socket on the server will be bound to the loopback 
interface only.  This may be overridden by specifying a bind_address. An empty
bind_address, or the address ‘*’, indicates that the remote socket should listen 
on all interfaces.  Specifying a remote bind_address will only succeed if the 
server's GatewayPorts option is enabled (see sshd_config(5)).
If the port argument is ‘0’, the listen port will be dynamically allocated on the 
server and reported to the client at run time.  When used together with -O forward
the allocated port will be printed to the standard output.