How tight should the wheel bearing nut be? 1998 Nissan Maxima

I've seen a couple of videos, some suggested doing them very tight, others
suggested only as tight as you can with your fingers. My car sounds like it's
going over railroad tracks while driving, I tightened the nut you can see in
the picture just with my fingers and it sounded 90% better, still a slight thud
thud when driving and it's come a little loose again.

How tight should it be? We only had the wheel bearings done 6 months
ago.

P.S, obviously by no stretch am I a mechanic, so I apologize if I got the
name wrong of the part. This is not intended as a permanent fix, I plan on
taking it to the mechanics as soon as they can fit people in again.