What do you guys know about GoPro camera's?

hello! My friend and I love to take pictures and videos and this year we decided to video tape our summer & put it into one big video to post on YouTube at the end of summer. Of course right now, we have been taking videos on my IPhone 6s but we want a better camera and decided to go for the GoPros because we have heard great things about them.

My questions though are what do we need to know about the camera? Price range? What is the best GoPro camera? Etc.

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