Using a HUD is fine, just don't let it be the be all end all to your ability to develop reads. You should always be trying to gather as much information as possible. Noting how everyone played their hands that get shown down. Paying attention to table dynamics(Some guy who keep relentlessly isolating some fish may show HUD stats of 40/35 but may not be opening nearly as wide when the fish doesn't limp behind). Etc Etc Etc Develop reads
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Profit