Here's how I use these levels... I have a 0,50,100 stretched over the previous week and previous day. Playing initial breakouts is a bad idea, it's always recommended to wait for a 50,0 or 100 level (i.e previous day/week's high/low/halfway point to be breached and then look for a retest (or some resistence close by) with confirming price action e.g pinbars on any timeframe. The fib extensions are great for tp/scaling in areas depending on what kind of price action is showing up. We can see aud/usd hit the previous day's 138 level and formed a pinbar with a great counter trade.