I'm starting to use bitcoins now, and I need help, what site should I take to start winning bitcoins?
Not too many options I am afraid any more! In 2013 and 2014 this was much easier, but this year all of the options have just died.
Bitcoin is getting considered more and more as money that you really have only one option at the moment, and that's to earn it.
Because it is money
It is a currency after all.
To get back on topic, it's best to earn bitcoin rather than winning bitcoin by some sort.
You can work for bitcoin or if you keep on posting you could upgrade your rank and join a signature campaign, that's one of the easiest way of earning bitcoin.