I main dps. But, I did tank too (drk)

I'm very very scary use as healer. Since if I failed heal players, I get faulted.

People said me.
I should know before the names of the boss's hit a "big damage" when I heal bigger same time .....

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Myself loved Astrologian design.

But, if I need learn first time healer. Need use Conjurer/White Mage?
Or Scholar as 30lvl like Astrologian

What healer's job one easier? My friend used AST, said it's great.