Honestly, I don't know either why the Fibonacci ratios work. I have my opinion, but it's just that: an opinion. Nothing more. All I know is that they're pretty much everywhere, and they are a very valuable tool in my toolbox.
You don't need any link. Just open up a chart of any liquid market, and start drawing Fib ratios. Start with the highest T/Fs (weekly, daily) and gradually scale down to 3 min. Use several pivots and the most common ratios. That's all.
if I had charting sw with a 'user inputs' Gann fan I'd use it along with fibos that I always use on all charts Advanced GET has a ' Gann Box ' - other programs have them - or there's often a ' Gann Angle ' tool to draw single tls; because of scaling problems Gann lines are best used on dedicated higher tf charts but 'boxes' can be constructed with them 1 X 4, 1 X 2, 1 X 1, 2 X 1, 4 X 1 1 x 4 = 75° 1 x 3 = 71.25° 1 x 2 = 63.75° 1 x 1 = 45° 2 x 1 = 26.25° 3 x 1 = 18.75° 4 x 1 = 15° chart: 4 GBs applied to SP 500 Monthly, 2 upper right GBs with 'box' off