I want to say something helped someone understand the difference between two things.

[alpacinou]

I want to say something helped someone understand the difference between two things. Can I use "drive home"? Is this correct and natural?

John didn't know the difference between Rugby and American football. James showed him a video that drove home the difference between the two sports.

If not, how can I make it work?

 

[Tarheel]

It's OK. The word "demonstrated" works also. (I suppose you could use "explained" but since it's a video "demonstrated" works better.)

 

[emsr2d2]

There's no need to capitalise "rugby" when used to express the simple name of the sport. It's capitalised in official titles such as "Rugby Union", "Rugby League", "Rugby World Cup".

 

[Barque]

The phrase "drive home" is used with something that reinforces something else. It doesn't work for me in your sentence. I'd put it differently.
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John didn't know the difference between rugby and American football. James explained the difference to him. He also showed him videos of a rugby match and an American football match to drive home the points he'd made.

 

[Rover_KE]

There's no need to capitalise "rugby" when used to express the simple name of the sport. It's capitalised in official titles such as "Rugby Union", "Rugby League", "Rugby World Cup".

... and also 'Rugby School' and the town called Rugby in Warwickshire.