〜なら
if (that's the case), if it's… you want
Plain form / Noun + なら
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なら picks up something the other person said, or a situation, and responds to it: 京都に行くなら、秋がいいですよ, "if you're going to Kyoto, autumn's the best time".
It's the conditional of advice and recommendations. After a noun it means "as for", "if it's … you want": 日本料理なら、この店がおいしい, "if it's Japanese food you're after, this place is good".
Unlike たら, the なら clause doesn't have to happen first. パソコンを買うなら、軽いのがいい: the advice applies before you buy.
It also answers "where's X?": 田中さんなら、もう帰りましたよ, "Tanaka? He's already gone home."
Examples
京都に行くなら、秋がいいですよ。
If you're going to Kyoto, autumn's the best time.
日本料理なら、この店がおいしいです。
If it's Japanese food you want, this place is good.
暇なら、映画を見に行かない?
If you're free, want to go and see a film?
パソコンを買うなら、軽いのがいいですよ。
If you're buying a computer, get a light one.
田中さんなら、もう帰りましたよ。
Tanaka? He's already gone home.