Make sure that before you are going to buy bitcoins make sure that you know how you are going to use it. And don't just invest in something you know that it is not trusted and there are lots of ponzi websites that are going to encourage you to invest to them that are promising big returns but in reality that is just a scam.
I think the correct word is "dont just invest" but "never invest" pal. Because I think most of these sites are popping up investment ponzi. As cloudmining, HYIP or other. As I said earlier it is better to hold bitcoin in our personal wallet, or make trades
hehe just my opinion.