If you're Sith, you don't usually teach more than necressiary to your apparentice (althrough Sith Lords and the like have been known for leaving books and other things like that behind them after their death so that the next generation can be stronger withoutt hem themselves being affected. Quite smart move, or so I think; your apparentice can't have access to your deepest secrets until after you're dead, thus he/she can't turn those secrets against you..)., but if you're a Jedi, it's the opposite, so I suppose that as a neutral, you'd choose for yourself whenever to get an apparentice or not and/or whenever to reveal any secrets to them...