1) Rules: the player is constantly forgetting the rules, or forgetting to use his Traits, Virtues and/or Rewards with a detrimental effect on the whole Fellowship. He thinks he has no other options than just the ones he can remember, or he simply plays too straightforward for the actual skills of his character. Either way, do you give advice to these players at the cost of making the adventure too easy (you constantly help them), or do you play no matter the consequences of their (often foolish) actions, at the cost of letting them even die?
2) Roleplaying: the player doesn't play as his character should be. He has the Traits Bold or Reckless, but he always acts very cautiously. He has a high score of Hope, but he often acts desperately. He should be a clever, quick thinker with a high Wits score, but he often lacks initiative and planning. How do you handle this kind of player? Do you make him revise his traits, or the choices he made during character creation later in the game?
3) Meta-gaming: the player doesn't acts as if he was his character, but constantly makes considerations regarding game mechanics. He doesn't think of the consequence on the story, he thinks of the consequences on the numbers: how many experience points he'll take, how many shadow points that would cost, and so on. He thinks that the enemies will make that choice because "the story requires them to", or that he can only do something that is covered by rules (kind of opposite to the player that always wants to bend or break the rules to make something too weird).
And, of course, the power-players. But we kinda all know how to handle them

Thanks!