abandoned everything he knew about

Pavel Pin

Senior Member
Telugu
Molly narrates the gameplay of Hrlan in poker game:

By 5:00 a.m., Harlan was down half a million. He'd abandoned everything he knew about poker and was playing like a frat kid, swinging for a home run on every hand.

What is the meaning of "abandoned everything he knew about"?
Does it simply mean "forgot""

Source: Molly's Game 2017
 
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