By the way, how would you go into trading something you haven't practised on demo? That's unnecessary risk. V100 isn't even as volatile as V75. You should demo trade it with the lowest lot size which is 0.001. Even with such small lot size, one can make more profit/loss daily on it than someone on 0.05 lot size on a currency pair on Forex. It shows how volatile the market is. Not even Gold pair is that volatile.
Going into trading without learning and having good understanding about how the market works has been the major problem with newbie traders, and after they have lost huge amount of money they began seeking for the knowledge. The Op question clearly shows he got zero knowledge about trading and luckily for him he has come to do right thing by asking the needful questions.
The deriv platform is specifically a Binary option trading platform formerly binary.com before they changed their name to deriv.
However, As types of trading has been listed by FivestarMvp, you can choose to learn all and later specialize on one or either choose to start on learning one that you may find suitable and develop your own strategy in order to profit.