Conor McGregor is a great fighter and boxer.
Oh is he?  What's his record?  Did he win against somebody great?
Not really, he is just a really great mixed martial artist.
Does he have any other interests and talents>
McGregor was in the UFC and that's it so not really to be honest.
Is the UFC important?  What is the UFC?
The UFC is the Ultimate Fighting Champship.
Alright, that seems legitimate.  When was it founded?
I'm not sure, but it was based in Las Vegas.