The pros of learning them is that you'll increase your knowledge and be better equipped to be making trading decisions the downside is that you may lose money during the learning process.
We don't need to lose money went learning option trade, there has some demo trade on every broker. You can easily learn with demo account, if you don't really trust on the demo you should compare it with the real chart did the chart was getting manipulation or not. As long i know the demo account its the same chart with a real account chart.
No you shouldn't do this, don't trade demo. Trade with a small account instead or trade pennies instead of trading with a demo account.
Why? Because with demo, you have no emotion and attachement to the trades. You will trade without fear or greed and basically can easily turn a 100K demo into a million.
Then you deposit your entire savings and end up blowing them. Why? Because the game changes when its real money on the line. So open a Bitmex account, fund it with like $10 and trade with $1 units, you will never go broke this way.