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The second is the hardest for even experienced players to handle. When players use their own real world knowledge and apply it to actions in game we call this "metagaming" or "metagame". Players are not allowed to apply knowledge they have personally to influence their characters in game. In short if your character wouldn't know it then they don't know it.
Example: "X knows Y has a health potion in his bag from viewing their character sheet IRL and asks their character for it as they're low on health. Y makes a bluff roll and succeeds to tell X he doesn't have one. X fails this roll but continues to pester Y saying he knows he has a potion even though his character wouldn't know this. "
What X has done here has detracted from the story and effectively sidelined it to argue with the DM over semantics of metagame. Just because you know something doesn't mean your character does. The most common situation is when a player steals from another player. Even though there's only so many people around and only 1 of them seems shady doesn't mean you can implicate them without evidence and sidestep their rolls just because you want your item back. You do have the power as a player in the game to force them to tell you but you have to deal with the consquences of your actions. Metagaming can cause serious problems in gameplay as it can make knowledge rolls obsolete and many characters rely on their vast amount of knowledges. Please try your best to not metagame and if brought to attention please acknowledge it so that we can move past it to have more fun.
