Probably easiest to just look at every thread @NPNKY has made.
Here are some of the most applicable:
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Advice for New Players, or "All the things I wish someone had told me when I first started."
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Raids are unfair, but not for the reasons you think - Raids MASTER
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A few things to know about the game before you decide if/when/how much to spend
There’s this list too: