Question: Simple Conditionals

Hello and thank you in advance,

I am used to Mathematica and am looking to switch, conditionals in Mathematica seem easy, like say


  If[0 < z && -6 <= y <= 6 && 0 < x < 1             ,Null             ,Return[0]];


How do you replicate this in an easy to read way without lots of nested if statements?

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