positional sacrifice

How do you learn to play move like B x h6 that Caruana played against Anand? (Candidates tournament 2016-round 10. dt. 23 March 2016.link-https://www.chess.com/news/caruana-beats-anand-now-leads-with-karjakin-at-candidates-9637) How much is calculation? How much is instinct or gut feeling? Or psychology to scare your opponent? Some GMs did not agree with the , move but it worked against a 2780 rated ex world champion. And how to defend against such move or how to prevent the opponent from making such move? Will someone explain? Thanks

Regarding Caruana's game...he had center control, and better piece activity.  Analayze Petrsoains games...

It takes a Super GM to see and play those positional sacrifice. We patzers can only watch in awe.

You learn by experience. Against higher rated opponents. Other seasoned players. Knowledge, through studying does lessen the gap depending on the quality plus being able to apply it. But the straight up best advice I'd say is investigate on your own. Analyse the game without prejudice. Block out the players and just go through it as if you're going to play them tomorrow. For both sides.

Thank you, friends and fellow chess lovers. My take from your reply is 'such moves are not easy, we need lots of hard work and practice to be able to make such moves or anticipate and prevent them from your opponents'. Thanks again. Further inputs are welcome.