Is castling really a necessary move, or it is an optional thing?
Once you and your opponent get beyond the very basic four move checkmate games, you will learn to make castling a priority.
Of course, every situation has to be judged on its own, and there are positions where castling is a mistake.
But in general, castling not only helps protect your king, it also helps you develop your rooks.
Is castling really a necessary move, or it is an optional thing?