I've read up on MF and I thought I knew what I was doing but someone just said that having 5% when glitching a boss like Anderial or Diablo is best for drops. Any input here? They said that anymore is bad.

don't do andy or diablo, best is rakanishu fk with exact 5%mf

0% mf on glitching act bosses is best

Andariel have Questbug and have this Questdrop with ore without open Quest.
@ Diablo you need a Game opened from someone who allready made the Diablo Quest, so you can kill Diablo with a Quest(open) Drop but without makeing the Quest.
Rare Items are the best in Classic and with 0%Mf in a Quest Drop you will have the most Time few rare Items.
5%Mf ore how much Mf ever makes your Rare Drops lower.

Excuse my being a noob guys but what does glitching a boss mean?

If u do andyruns more mf is better chance for soj drop

When you haven‘t done the quest but kill the boss in a game where the quest is closed. You won‘t get the quest ofc but you will get questdrop. Repeat as often as you want and win.

Don't glitch just run 150 mf and make your own games drops are decent enough but yeah when glitching don't use mf unless you want some uniques

SoJ's apart :

0% is best.
1% is worse, but still better than 2%, that's better than 3% ... There's no magical breakpoint here (only some, due to rounding numbers).

It doesn't not have to be bosses as well.

You can join a created game with travincal quest done in act 3, walk to durance level 2 waypoint and make your own game.
Kill mephisto for quest and join a game with travincal already finished, have 0 magic find and kill travincal over and over. Have fun enjoy this supreme mf technique!