Hi guys,
I'm a new player. I confuse about the "lead" concept.

For example, at pre-flop, player A open raised $10, player B called. Player A is leader. But in the case, player A open raised $10, player B re-raised $30 and player A called. Who is the leader?

Please help me. Thank you very much!

Whoever raised or reraised takes the initiative of the hand on the street. For you case, its player b, he's more likely to win the hand.

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Thanks for your response. So you think Player B is leader in the case 2, right?

Is case 2, player B is considered "the last aggressor", since he was the last person to say "Raise". The standard play is for the caller on the previous street (pre-flop in this case) to check to the raiser on the next street (the flop).
Occasionally, the player that was not the last aggressor/raiser will lead into him on the flop, with what's called a donkbet, or what used to be called a "weak lead" (because leading into the aggressor usually represented a weak hand). The majority of the time, a player that is OOP and just called the last raise will check the flop.

FWIW, When I hear the terms "leads out", I automatically think the player is out of position (acting first). It always does my head in a bit if he checks to the raiser that is in position, and a commentator says the player in position "leads out". He's hardly "leading out" if the action was checked to him. :/ I prefer the terms "donk" or "c-bet" to describe the first bet on the flop, since those terms also indicate what happened pre-flop.

Thank you very much