How do I use Wi-Fi on my Samsung Galaxy Ace?

Ok this may sound like a silly question but I just got a new phone and this is my very first with internet/data. How does wi-fi work? I get free wi-fi at work so does that mean when I am on wi-fi that I am not using/spending data? I haven't tried using wi-fi at all yet but I would like to try using my netflix... show more Ok this may sound like a silly question but I just got a new phone and this is my very first with internet/data. How does wi-fi work? I get free wi-fi at work so does that mean when I am on wi-fi that I am not using/spending data? I haven't tried using wi-fi at all yet but I would like to try using my netflix account to watch movies and stuff on my lunch and if there is a way to cut down on data cost that would be awesome. I'm just so new to data I am learning still how to keep my usage low. Any help is appreciated also how do I turn wi-fi on and my data off? Airplane mode?
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