yeah essentially what has been said
imo you should either have a monster hud or a hud with monster pop ups that can show you frequencies of most common lines.
vs most people most stats will be useless, but you can grind 5 figure samples on some people and then it becomes really useful.
if you're not sure, just add the stats and see if they prove of any use, i do think river ones are useful. Things like Won at Showdown after raising, after betting [maybe sizing dependent
]... If you play poker full time you will inevitably wind up with 10, 20k hands on some people