The quotes don't seem correct. You would be buying the synthetic 18/19 call spread at a large credit. 100 shares from 19 + 18P at 0.80 = long synthetic 18C from 1.80. Then shorting the 19C for 3.30. You'd "own" the 18/19 call spread from a 2.50 credit. I am logging into my front-end now. Edit: The 19C is 2.15x2.40 now. The 18P is 1.25x1.30. The 18/19C spread is 0.40x0.95 and the synthetic call spread (fenced shares) is 0.82 marketable.
In any event--don't buy the shares if you're looking to trade the long stock/long put/short call. Just buy the 18/19 call spread as it's equivalent.
I think you need to use the targetted price (tp) while trading on the money markets. It gives you an ease to spend some time for other purposes as you cannot watch the market all the time. So, all the beginners are advised to use the target price. Thank you so much!
I don't know anything about options but I set targets on futures based on average MFE in my time frames. It keeps things simple and it works for me. You have to test various strategies and understand yourself to find something that works for you.
I never set TP's, I always ignore chart resistance in uptrends and support in downtrends. I'm currently trialling SL's at 2 x ATR like @smallfil mentioned above (using ATR20 like the Turtles) and actually, I'm generally looking to pyramid where other traders might be taking profit - as long as the trend's still strong.