most people who have questions but don't ask are those who are scared of other's judging them and their 'dumb' question. turns out most people don't care, they forget about it after a day or week. so one should not miss the opportunity and ask questions actively.
it doesn't mean "think and shoot", keep it with yourself for a moment or two and then ask, don't be in a hurry (you can ask later too). read programming and questions to learn more.