It is good if you can invest your bitcoins on the legitimate company or site but the thing is if your lucky to see one, but you will need a courage to gamble it and I think if you really don't want to risk you money or bitcoin then don't do it and just trade your bitcoin and there are other methods in increasing your bitcoin!
I think now is to look for sites that are legit hard friends, many sites related investments bitcoin just running Ponzi practice. If I think it is safer to invest bitcoin by holding bitccoin course in personal wallet
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.