Help me understand Spark Profiler, I am slow.

I looked at the documentation and at youtube videos but there is one thing I do not understand

How am I supposed to tell what is bad and how to follow that path? Since I am on a world and not a server, the youtube videos examples dont give the best example

Im not asking someone to just fix my issue, I want to genuinely understand how to use spark profiler past running the commands and getting reports.

How do I read reports accurately.
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