Summarize the following:
Check to see if your opponent has widened eyes, is drumming their fingers, or bouncing their legs. These and other body language tics can indicate nervousness. Depending on how they’re betting, that can either mean they have a good hand or, more likely, that they have a bad one. If you’re playing against someone who is acting uninterested in the game but stays in despite heavy betting, chances are they have a strong hand. As much as they might try to pretend they’re not excited about their cards, their willingness to stay in the game shows there’s something going on under the surface. If your opponent checks their cards and then looks at their chips, there’s a chance they just did that because they want to know how much they can bet. Be cautious though, that also might be a sign of nerves at getting a bad hand and not having too many chips left! Often, novice poker players try to intimidate competitors by staring them down and being more aggressive when they have bad hands, especially if their hand is good but not good enough (like a low pair). Conversely, if an opponent who usually makes eye contact suddenly starts avoiding eye contact, that could mean they have a great hand and are trying to hide it.

Summary:
Look for tics and fidgeting. Identify when someone is trying to bluff a good hand by faking indifference. Observe if your opponent looks at their chips. Notice if an opponent is trying to stare you down.