I played Diablo 4 Early Access Beta yesterday and this is what helped me run through Act 1. Stutter step, kiting, or hit and run is the best way for a ranged class to evade some of those nasty damages that can instantly kill you. You can do it in D4 Beta by pressing Shift+Left click, moving away then Shift+Left click again.
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Song: Bury the Light by Casey Edwards