Range advantage is one of the most important concepts in postflop poker.
Preflop action determines which combinations each player can realistically have. Once the flop arrives, those ranges interact with the board in different ways. A player who raised before the flop does not automatically have the range advantage on every possible texture.
For example, a big blind caller can have many suited connectors and suited one-gappers that interact extremely well with low and connected boards. The preflop raiser may have more premium overpairs, but the caller can still have a stronger concentration of nutted hands.
This is where understanding range construction becomes more important than looking at your own two cards.
Players who want to develop this skill can continue with
Postflop poker complete guide to postflop strategy, where board texture, range interaction, position, and postflop decision-making can be studied as part of the same strategic framework.