The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/9.5/ssh-tunnels.html
Description:
"The first number in the -L argument, 63333, is the port number of your end
of the tunnel; it can be any unused port. (IANA reserves ports 49152 through
65535 for private use.) The second number, 5432, is the remote end of the
tunnel: the port number your server is using. "
as a beginner This took me some time to understand what do you mean by "your
server" "your end of the tunnel "
