Position determines the order in which players act during every betting round after the flop. Acting later provides valuable information because opponents reveal their decisions first. This informational advantage allows players in late position to bluff more effectively, value bet more accurately, and control pot sizes with greater precision.
Early position players face the opposite challenge. Since many opponents still have the opportunity to act, their opening ranges must remain tighter. Opening too many weak hands from early position often leads to difficult postflop spots where opponents hold stronger ranges and positional advantage.
Late position, especially the button, allows players to profitably open many more hands because fewer opponents remain behind. Even when called, acting last throughout the hand creates opportunities to realize equity more efficiently.
As your understanding develops, it becomes helpful to study
Poker starting hands chart explained, which breaks down how different hand categories perform across various positions and stack depths.