Serious Got 50 Visa Card free, how do I "Invest" it?

I don't think that you should invest in BTC. Putting 50 dollars into a BTC account won't even do much until its been a few months, and by the end of that few months the value will either go up like 10 bucks or decrease 10 bucks. I would just spend it. You have 50 dollars, do something useful with it for the time being. If you really want to sit around for a while just for 50 dollars to go up to 60, which isn't even guaranteed, be my guest.