The add on gives you detailed information about commands. It extends the command list when entering /world allowing to click on the commands in the list to get a description, usage and examples of how to run them. You can also hover over usage arguments to get even more info on what the argument is.
You can also enter /hm or /helpme to get a list of all commands registered with HelpMe. Most of my plugins are integrated into HelpMe.
There's a basic wiki on GitHub for more information.
I've been meaning to create a dedicated post about HelpMe but with everything going on in my life right now I just haven't had the time or energy to do much of anything, hence my lack of activity. I'm falling way behind. Sorry guys