Then don't bet if you don't know a certain fighter or team, and regarding ground skills, just like Khabib Nurmagomenodov fighters with exceptional Ground skill and has a wrestling and sometimes dominated fighters with no knowledge at all.
If this is the case I tend to watch other people that are well known to that fighter, I surely doubt that there is no written information for that specific fighter on the internet or Wikipedia for that given person, but in this kind of scenario I tend to go to known prediction for that fight on the net and sometimes see the odds if given speculation will tally with the odds, then I would go with that bet, and we should surely have information for both fighters in given assessment on the outcome of their fight.
But sometimes instinct is your friend and if you would have something in your mind then go for it and don't mind other speculation.