sqli dumper dorks

Hello guys

i would appreciate it if some1 would help me.
i have some problems i dont understand 100% sqli dumper 8

my biggest question is what is a dork
how many do u need to make a combo list that works

second question: do u need to get new dorks evreytime u use them. or can u use them over and over.

third question
where can i find/make psn dorks
are there specific ones 4 psn or do i just need to use game.php

ty 4 helping

dorks are actully use for what are you searching for like specific games combos like psn network xbox origin steam netflix all the way any kind website you neet dorks for it