The Greek Gift sacrifice as a pattern/motif which you are likely to encounter in your games, so it's very useful to be able to recognise it, whether as a threat or an opportunity. As ever, there are plenty of related online videos and lessons available. The Greek Gift is an example of how quickly a game can culminate through a sequence of forcing moves. Such moves - checks, captures or threats of capture - force your opponent's hand, leaving them with few if any choices as you strengthen your position and weaken theirs. So look for forcing moves in your games!