>>3800461
Well, the most important is save point management, in case you didn't knew, hard mode limits you into using each only once so it's smart to not save everytime you find a new one and leave some for backup.
Second is that some of the party members are seriously broken, >>3797388 Nern can singlehandedly make healing items useless since he can restore HP, MP and TP to any character including HIMSELF, this saves you a ton of mags since you won't have to bother with colas and jerky so you can buy more weapons an armor.
Lastly, satus effects are king for tough bosses, stunlocking an enemy while he bleeds, burns an is poisoned can make even the Joy mutants melt in just a few turns. Also, here's a cheeky trick that makes the game easier but also lamer: If you inflict mutants with the "Pissed" status effect, they can't use theyr perma-death moves.
All of this should still be usefull even with the nerfs from Definitive Edition.