Deciding when to castle

I've lost a lot of games of chess by putting off castling until it is too late. Not that I always have a choice mind you, as sometimes my opponent creates enough threats that castling isn't the best choice.
Here is a game from the current Australasian Masters IM tournament, with young Canberran Albert Winkelman punishing a king caught in the centre. 6.Nh3 is a move I'm not familiar with, but it looks no worse than other main lines. However the real killer move is 17.Bh6! which connects the White rooks while exposing the Black king. After that the game was essentially over, although Black did try a couple of tricks before resigning.


Winkelman,Albert (2283) - Maguire,Tom (2139) [B18]
2019 Australasian Masters IM Norm Tourna Melbourne Chess Club (6.1), 19.12.2019