In standard casino games like blackjack, you play strictly against a cold, mathematical algorithm or a heavily regulated dealer following rigid rules.

These physical and behavioral leaks are known universally in the poker world as "tells."
Reading Body Language at the Table
When an amateur player looks down and sees pocket Aces, their heart rate instantly spikes, and their body naturally reacts to the massive adrenaline dump.

If a player sighs loudly, slumps their shoulders, and tosses their chips in aggressively, they are almost certainly holding an absolute monster hand.
Acting overly confident or talkative during a hand usually indicates a massive bluffA player who suddenly goes completely silent and rigid is incredibly dangerousAlways watch a player's eyes the exact moment the flop hits the felt Why Sizing Reveals Everything
If a player has been cautiously folding for an hour and suddenly raises pre-flop to five times the big blind, they hold a premium pocket pair.

A rapid, instant "snap-call" usually indicates a medium-strength drawing hand, as the player didn't need to calculate a complex raising strategy.
Establishing Baselines and Avoiding Fake Tells
If a player always shakes uncontrollably because they drank six espressos, their trembling hands are entirely meaningless regarding their card strength.

Furthermore, as you move up in stakes, you will encounter highly skilled professionals who actively broadcast "reverse tells."
Observed TellCommon Meaning (Amateurs)Action RequiredShaking / Trembling HandsMassive adrenaline, monster handFold all marginal hands instantlyStaring aggressively at youAttempting to intimidate, weak handConsider a re-raise or hero call
Reading poker tells transforms the game from a dry mathematical exercise into a thrilling, deeply psychological battle of wits.