With help command, you can get an instant brief description on the command and the flags that can be used along.
$ loophole [command] --help
Loophole - End to end TLS encrypted TCP communication between you and your clients
account Group of comands concerning loophole account
completion Generates bash completion scripts
help Help about any command
http Expose http server on given port to the public
path Expose given directory to the public
webdav Expose given directory to the public via WebDav
-h, --help help for loophole
-v, --verbose verbose output
Use "loophole [command] --help" for more information about a command.