Personally I'm awful at using them, other than healing and resource potions (managed etc). I never use atk/def boost pots, and resistance consumables just aren't a thing for me, except for antidotes because some games have really nasty poison that drains your health quick.
Same with gear. I don't keep a separate set of gear to resist fire damage for instance.
I mostly focus on one set or gear and focus on becoming better at the game instead of taking 80 fire damage instead of 90.
I'm also bad at remembering using tools like traps and mines. I just don't have the patience to run around and set up traps or c4 before a fight and have the monster chase me to it.