Come in handy
Definition 1 of 1
Pro Tip 1/3Situational Relevance
Think about situations where something might unexpectedly be of help. 
Learning basic car repair can come in handy when traveling.
Pro Tip 2/3Potential Preparation
It implies preparing for future situations where something could be useful. 
Knowing how to cook comes in handy when you start living alone.
Pro Tip 3/3Unexpected Utility
It suggests something could be more helpful than one might initially think. 
That trivia game really came in handy at the quiz night.